The New Encyclopaedia Britannica, Volume 15

19th century activity administration American amino acids became behaviour bonds Britain called chains Christian chromatophores church ciliates civil common contains cost countries court culture cystine cytostome debt developed disulfide bonds early economic effects England English enterprise Europe factors figures flagella flagellates France function gametes German groups hemoglobin human important increase individual industrial influence interest involved issues land macronucleus magazines major ment metres modern molecular weight molecules movement newspapers organization output ownership parasitic parrots parties peptide percent period person political pollution printing problems procedure production propaganda prophets prosody prostitution proteins Protestant Protestantism Protozoa psychology psychosis Ptolemy public opinion published Puerto pulsars pumps Punjab puppet theatre Puritan reform result Roman schizophrenia sexual social society species structure symptoms syngamy term theory tion tradition United usually