INDEX 



135 



Trypanosoma brucei (trip"a-n6-so'ma 

 broo-se'I), 102 



Trypanosoma gambiense (trip"a-no- 

 so'ma gam"bi-enz'e), 74*, 105 



Tuberculosis, Pulmonary: cause of, 19 



Turtle : parasite of, 106* 



Typhoid fever : cause of, 16*, 19 



Ulcer, Infantile : cause, 104 



Ulcers, Intestinal and liver : cause of, 103 



Uroglenopsis americana (u"ro-gle-nop'- 

 sis a-mer'i-ka'na) : cause of disagree- 

 able odors and taste in water, 51*, 60 



Uroleptus halseyi (u"ro-lep'tus hal'se-i) : 

 derived organization, 37*; genes and 

 chromosomes, 41 



Uroleptus mobilis (u"ro-lep'tus md'bil- 

 is) : conjugation stage, 85*; cyst of, 

 35* ; reproduction, 83, 84* ; sexual ma- 

 turity, 114, 115; vitality tests, 112, 113 



Vacuoles (vak'u-olz) : contractile, 90, 

 91 ; gastric, 94, 96 



Van't Hoff's (vant hofs) law, 101 



Venereal diseases : cause, 26, 27*, 30 



Viruses, Filterable, 14 



Vitality : defined, 8, 34 : fertilization not 

 necessary, 115 ; periodic reorganization, 

 110 ; potential renewed by cell division, 

 84; potential renewed by conjugation, 

 86; potential renewed by endomixis, 

 87; tests, 112. 113 



Volvox (vol'voks), Genus of: descrip- 

 tion of, 54; differentiation into male 

 and female, 55*, 114 



Volvox aureus (vol'voks 6're-us) : col- 

 ony of, 55* 



Volvox globator (vol'voks glo-bat'or) : 

 colony of, 55* 



Vorticella campanula (vor"ti-seTa kan- 

 pan'u-la) : description of, 13* ; discov- 

 ered by Leeuwenhoek, 12 



Wallengren (wol'en-gren), Hans Thure 

 Sigurd (1864- ), Swedish natural- 

 ist, 89 



Waste and repair : see Metabolism 



Water : cucumber-like odor, 61* ; dis- 

 agreeable odors and tastes, 60, 63 ; 

 fishy odor, 51*; geranium-like odor, 

 64 ; green coating in pitchers and 

 glasses, 58* ; in protoplasm, 32 ; lost 

 in encystment, 35 



Weil's (wilz) disease, 30 



Weismann (vis'man), August (1834- 

 1914), German biologist: argues pro- 

 tozoa are potentially immortal, 111, 

 112 



West Indies : origin of some islands of, 

 78 



Wood : origin of, 33 ; result of activity 

 of protoplasm, 9 



Worm, Marine : parasites from digestive 

 tract of, 53* 



Worms : dependent on bacteria, 22 ; first 

 appearance, 5 



Xanthidium armatum (zau"thid'i-um 

 ar-ma'tum), 59* 



Yaws (yoz) : cause, 27 



Yellow color of plants, 45 



Yellow fever : cause, 26, 28, 29, 30 ; 

 transmission of, 104 



Zoospores (zo'o-spors) : in the volvox 

 group, 57 ; of algae and thallophytes, 

 44 ; of Sphaerella lacustris, 54* ; of 

 Uroglenopsis americana, 51* 



Zoothamnium (zo"6-tham'm-um), 84 



Zooxanthelleae (zo"6-zan-theTa), 65 



Zygospore (zi'go-spor), 57 



Zygotes (zi'gotz) : among Sarcodina, 

 80 : in the volvox group, 57 ; of the 

 desmids, 60 



Key to Pronunciation 



