Elements of Vegetable Histology: For the Use of Students of Pharmacy, Preparatory to the Study of Pharmacognosy, with 62 IllustrationsThe author, 1905 - 112 pages |
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Elements of Vegetable Histology: For the Use of Students of Pharmacy ... Daniel Base No preview available - 2019 |
Elements of Vegetable Histology: For the Use of Students of Pharmacy ... Daniel Base No preview available - 2015 |
Elements of Vegetable Histology: For the Use of Students of Pharmacy ... Daniel Base No preview available - 2018 |
Common terms and phrases
acid alcohol angle angular aperture appear bacteria bark bast fibres Bastin blue bundles called cambium cambium zone cavity cell-wall celloidin cellulose cent CHAPTER chloral hydrate chlorophyll chlorophyll bodies chyma collenchyma color consists cork cells cover glass cross-sections cutinized diameter dicotyls dilute dissolve ducts edge elongated endodermis epidermis eye-piece ferns fibro-vascular focal length focus Geranium stem glycerin hæmatoxylin hairs high power higher plants hilum hydrochloric acid hyphæ inch inner intercellular iodine iodine solution layer leaf lens lenses light lignified longitudinal low power magnified methyl-green microscope monocotyl mount in water mucilage nucleus object ordinary parenchyma outer parenchyma cells phloem phloem masses phloroglucin pith portion proteid protoplasm radial rays reagent refraction resin root sacs seen slide spherical spores stained starch starch grains stomata stone cells structure substance surface thick-walled thickened thin tion tissue tracheids transparent tubes walls wood fibres xylem yeast
Popular passages
Page 10 - ... the angle of reflection is always equal to the angle of incidence, the image for any point can be seen only in the reflected ray prolonged.
Page 20 - ... have considerable chromatic aberration. Most eyes have power of " accommodation," that is, of altering their focal length at will so as to perceive objects at different distances away. There are, however, several possible optical defects in eyes, which may arise from various causes : — a. The waves may be brought to a focus in front of the retina instead of on it. Such eyes are called " nearsighted," and may be helped by the use of diverging lenses. b. The waves may be focused back of the retina....
Page 12 - In optics a prism is any transparent medium comprised between two plane faces inclined to each other. The intersection of these two faces is the edge of the prism, and their inclination i* its refracting angle.
Page 108 - Whitman, 1. c., p. 71. the object for some hours in it. It may then be imbedded as follows : Dip the smaller end of a tapering cork in the celloidin solution, allow it to dry for a moment (blowing on it if necessary), and then build upon it a mass of celloidin, allowing it to dry a moment after...
Page 29 - ... turn the body tube down by means of the coarse adjustment until the objective is closer to the preparation than is indicated by the equivalent focus of the objective, watching carefully with the head to one side to see that the front lens is not forced against the slide. Look into the microscope and slowly raise the tube by the coarse adjustment until the object is almost in focus; complete the adjustment by means of the fine adjustment. Never focus down while looking into the instrument. Failure...
Page 108 - Some of the paraffin is then poured into a small paper box or into adjustable metal frames. The object is transferred to it, and after the mass has begun to set it is placed in cold water until quite hard. It is then cemented (by paraffin) to a square piece of cork and placed in the microtome.
Page 20 - In the simple microscope the measure of the linear magnification produced is the ratio of the apparent diameter of the image to that of the object, while the superficial magnification is the square of this ratio.
Page 11 - As the beam enters the water it is bent toward the normal, or perpendicular, to the surface ; that is, the angle of incidence is greater than the angle of refraction (the angle of refraction is the angle the refracted beam makes with a normal to the surface).
Page 43 - In the higher groups, however, there is more or less division of labor among the hyphse, and they become consolidated into false tissues, which acquire definite shapes according to the species. Of this character are the fructifying organs or carpophores, which constitute the above-ground parts of the agarics, puffballs, cup-fungi, etc., and the sclerotium, a compact hard mass of thick-walled hyphse, which serves as a resting stage in the development of some species, for example, Ergot of rye.
Page 108 - Make a thick solution of celloidin in the same mixture and soak the object for some hours in it. It may then be imbedded as follows: Dip the smaller end of a tapering cork in the celloidin solution, allow it to dry for a moment (blowing on it if necessary), and then build upon it a mass of celloidin, allowing it to dry a moment after each addition. Transfer the object to the cork and cover it thoroughly with the celloidin. Then float the cork in 82-85$ (0.842 sp. gr.) alcohol until the mass has a...