Morwell Down.-Brownish-grey: a coarse open-textured griesen, with a quasi-scorified look.

North Hessary Tor.-Light drab: moderately-fine-grained granular granite, mainly felspar and quartz, with black mica; quartz blebs and some kaolinization; schorl in patches.

North Hessary Tor.-Reddish-brown: earthy felspathic vein in quartz-schorl rock; contains irregularly distributed quartz, partly crystalline.

North Hessary Tor.-Red: coarse but regularly-textured granite, mainly felspar with black and occasionally light brown mica; much of the felspar crystalline.

Nuns Mine.-Light pink; sub-crystalline pegmatite with veins and nests of schorl-a few scales of greenish talc; some interstitial kaolinisation.

Okement (West).-Pinkish-grey: felspathic rock developing quartz and mica-rather rough texture. Okement (East).-Creamy-grey

medium-grained granite with porphyritic quartz; mica well developed in plates and nests; acicular aggregates of schorl.

Okement (East).-Grey: quartz granules with schorl; a little felspathic matter.

Peek Hill (Walkhampton).-Dark rose-red: fine-granular mixture of felspar and schorl, with occasional light porphyritic felspars; some of the schorl acicular.

Peek Hill,-Brownish-yellow: mainly even-textured granular mixture of felspar and quartz, in which the components are casually prominent rather than porphyritic, with black mica, often in good hexagonal plates; encloses schorlaceous nests, partly granular and partly acicular.

Peek Hill.-Yellowish-grey heavy compact fairly even-grained porphyritic granite, with black mica and schorl.

Peek Hill.-Red and black: felspar, schorl, yellow-lustred investing mica; nearly all finely granular.

Pew Tor (Whitchurch).-White: a coarse large-textured granite with black mica and schorl-a typical "outer edge" variety. Plaster Town (Whitchurch).-Brownish-yellow: medium-textured pegmatite-quartz blebs in sub-crystalline felspathic matrix, in veins penetrating Carboniferous slate.

Plym Valley (Cadover).-Pink: massive vitreous felsite weathering dull, with little nests of schorl weathering into nodules. Plym Valley (Cadover).-Yellowish-grey granular aggregate of quartz, semi-kaolinized felspar, and pale mica, with disseminated schorl.

Plym Valley (Cadover).—Pale pink-grey massive sub-crystalline felsite with schorl and a little porphyritic quartz.

Plym Valley (Cadover).-Cream: earthy-weathering felsite with porphyritic blebs and crystals of quartz, crystalline fragments of felspar, and a little schorl.

Plym Valley (Cadover).-Pinkish-grey coarsely sub-crystalline schorlaceous pegmatite, with schorlaceous veins. (The five pre

ceeding are from the bed of the Plym at Cadover Bridge.) Plym Valley.-Dull cream: oolitic-granular felsite, compact, with no differentiation visible to the naked eye.

Plym Valley.-Dark purplish-brown and light-pink: the base has a fine cindery look, which seems to represent decaying felted matter, probably schorl including some quartz; the lighter parts are decaying porphyritic felspars. Requires further examination.

Plym Valley.-Dull puce: a compact porcellanous felsite, dotted with needles and small aggregates of schorl.

Plym Valley.-Orange: coarse-crystalline granite, mainly felspar, weathering orange from pink: a small quantity of white and black micas, a little schorl.

Plym Valley. - Reddish-brown and black: the matrix is composed of small felspar crystals closely compacted in a base of quartz and schorl; and in this are contained a number of large porphyritic felspar crystals. It may be called therefore a porphyritic-felspar-schorlite.

Plym Valley.-Grey; fine-textured granular felsite, base mainly quartzose; with occasional quartz blebs and imperfect felspar crystals, and cavities whence others have disappeard.

Plym Valley.-Deep red body of rock massive felspar; quartz about half as plentiful; schorl scattered throughout.

Plym Valley.-Drab: porcellaneous felsite with flow structure and a little schorl; some elongated vesicles.

Plym Valley.-Grey: a schorlaceous greisen, with yellow and red scaly mica aggregates, verging on talcose. (These nine are from the bed of the Plym at various points above Cadover Bridge.)

Princetown.-Warm-brown: this consists of large felspar crystals and quartz crystals and masses distributed porphyritically through a smaller quantity of fine sub-porphyritic granite with abundant black mica in well-formed plates.

Portledge (Bideford Bay).-Warm-brown: a vein of granitoid material in the Trias discovered by Mr. T. M. Hall. It differs in no essential character from the elvanitic rock of Withnoe elsewhere described, only carrying the chain a link further. Ringmore (Meavy).—Pale pink: fine granular felsite with little mica and schorl, porphyritic felspars and quartz blebs. VOL. XXIV.

Rivalton (Langtree).-Brown: from felsite boulder, fine saccharoid

texture.

Roborough Rock (Buckland Monachorum).-Greenish-grey: finely granular felsite approaching the vitreous, with some quartz differentiation.

Roborough Down (ditto).-Greenish-grey; compact sub-vitreous base, with small pyramidal quartz crystals, and cavities from which they have disappeared, the latter occasionally lined with a greenish-yellowish crust. Weathers earthy and ferruginous. Largely used for building in the Middle Ages. Rockham Bay (Morthoe).-The granitic and felsitic pebbles of this spot include: Yellowish-brown granite; greenish-grey schorlaceous granite; massive red-brown felsite or vitrophyre; purplishred compact felsite; red-brown felspar porphyry; warm-brown felspar porphyry; greenish-brown felspar porphyry with zoned felspars; brown-grey granular compact felspar porphyry; brown-red compact quartz-felspar porphyry, with varying crystal contents; greenish felspar porphyry, compact, but with granular aspect; greenish-grey felspar porphyry with orange porphyritic felspars; brownish felspar porphyry with dark-brown mottlings. I may note here also the occurrence of hypersthene-augite-andesite.

Saddleborough (Shaugh).-Dark grey: the base of this rock is a fine-textured schorlite containing numerous small porphyritic crystals of pink felspar, some well formed and largely kaolinised; there are a few porphyritic quartz blebs.

Saddleborough.-Dark grey and pink a similar rock, forming a junction with an earthy schorlaceous felsite.

Saddleborough.-Dark grey: a third variety in which the base is much coarser, owing to the development of the quartz. Saddleborough.-Cream: coarse texture; earthy felspar containing porphyritic quartz, some sub-crystalline; and a little schorl. Saddleborough.-Light greenish-grey: a coarse uneven-textured greisen, with mica in nests, and needles and patches of schorl. Saddleborough.-Black and white: a rough felted schorlaceous base, with decayed white porphyritic felspars, and an occasional quartz bleb.

Saunton boulder.-Pale red: a somewhat irregular mixture of felspar, quartz, and greenish-black micaceous matter in patches and strings, closely resembling the mica in the more massive portions of the Eddystone gneiss. In fact the rock seems much more like an imperfect gneiss than any local granite with which I am acquainted.

Shaugh.-Pale brown: finely oolitic -granular pegmatite with occasional mica.

Shaugh.-Pale brown, or brownish-grey: saccharoid-textured felsite with a few cavities whence quartz crystals have disappeared. Shaugh. Reddish: irregular texture; chiefly pegmatitic, with occasional distribution of white mica; the felspar contains needles and clusters of schorl.

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Shaugh. Cream: granite at junction with schist; saccharoid earthy texture with porphyritic quartz, traversed by granularquartzose vein containing fine schorl.

Shaugh. Flesh colour: well-charactered rather coarse granite with white mica and a little schorl.

Shaugh. Pale pink: duplicated vein in slate; one half a pegmatite, felspar predominant; the other more quartzose and containing mica.

Shaugh. Dull grey: granite next micaceous schist; felspar crystals largely developed, with fine insterstitial granitic matter, mica predominating over the quartz.

Shavercomb, Plym Valley.-Pale dull pink; an irregular pegmatite with porphyritic felspar and quartz, and casual schorl; base mainly felspar.

Shavercomb.-Reddish-grey: massive heavy quartzose rock with ferruginous matter.

Shavercomb, junction rock penetrating highly-altered slate.-Dull flesh colour really a coarse luxulyanite, mainly composed of pink felspar and black schorl, with irregularly distributed quartz. The slate has been changed for the most part into a greenishgrey felsite thickly spotted with schorl.

Shell Top.-Grey: coarse schorlaceous pegmatite, partially kaolinised, with quartz veins.

Shell Top.-Light red-brown coarse and irregularly-textured granite with black mica.

Shillamill (Tavy valley, below Tavistock.)-Colour varying with position from warm-buff through shades of brown and cream colour to plain grey and greenish-grey: an elvan, granitoid and porphyritic in the centre of the dyke, thence ranging on either side through more even-grained and felspathic examples to a marked quartzose form. Different examples from this one dyke may be taken to represent half a dozen different felsites; but they all pass into each other, the differences being mainly dependant on the physical character of the ground mass. Felspar and quartz are both at times porphyritically developed; mica occurs disseminated and in clusters: there is chlorite and apparently a little hornblende.

Slapton Sands (among beach pebbles).-Red-brown: vitreous felsite, with white patches and imperfect crystals of felspar; a little quartz and scaly mica aggregates.

Slapton Sands.-Dark greenish-grey: vitreous felsite, with white porphyritic felspars, fairly crystallized; some quartz, rather more than in last example.

Slapton Sands.-Pinkish-brown: compact felsitic rock, originally vitreous, now tending to earthy degeneration, with some development of quartz, decayed felspars, and black mica. Has all the appearance of one of the so-called Triassic lavas—“felspathic traps."

Slapton Sands.-Grey: vitreous felsite developing small crystals of felspar, blebs of quartz, and numerous nests and plates of black mica.

Slapton Sands.-Red and grey: a red schorlaceous pegmatite veined by quartz and schorl.

South Milton, Horswell.-Reddish-brown : a quartz-porphyry passing into andesite, base mainly felspathic, with porphyritic quartz blebs, and an occasional felspar crystal.

St. Bude.-Pale - brown: a massive felspathic rock developing felspar crystals of fair size, many of them twinned, and containing spicule which the late Mr. John Prideaux described as needles of schorl-more probably, however, they are hornblende, but they are all decayed and no sufficiently fresh specimen for determination has occurred. The relations of this rock to its neighbours are not clear-i.e. whether it is an independent boss or an extreme phase of a neighbouring doleritic dyke. Stolliford.-Pink: regular granular texture, generally with nests and strings of scaly mica and occasional quartz crystals. Stone Tor, Chagford.-Grey: a granular-crystalline granite, with an approach toward porphyritic characters in the felspars; black mica in flecks and nests.

Tavy Valley.-Red: close-textured even-granular pegmatite, with a little schorl.

Tavy Valley.-Pinkish-red: granular pegmatite with irregularly distributed schorl.

Tavy Valley.-Brown: a deep-brown vitreous base mainly quartzose with an abundance of irregular and crystalline porphyritic quartz-one example zoned, and a little felspar.

Tavy Valley-Red: sub-crystalline schorlaceous pegmatite, with occasional porphyritic felspars, and veins of quartz and schorl. (These four examples are from bed of Tavy above Horndon.) Bed of Tavy (pebble Beerferrers railway bridge foundations)— Grey; compact sub-vitreous felsite, developing crystals of felspar, quartz, mica, and apparently hornblende.

Bed of Tavy, (ditto.)-Pebble, reddish-brown in centre, dark grey outside; a close textured, sub-crystalline slightly porphyritic granite, also apparently contains a little hornblende.