CONTENTS. 



Yeast. 



General characters — Fermentation — Appearances of yeast under the micro- 

 scope — Structure of yeast cells — Chemical composition — Mode of multiplication 

 — Growth in Pasteur's fluid — Physiology of yeast — Laboratory work. 



p. I — lo. 



II. 



Peotoooocus. 



Habitat — Histological structure — Modes of multiplication — Dependence on 

 light — Physiology of Protocoocua — Motile stage — Laboratory work. p. ii — 16. 



III. 



Peoteus Animalcolk. Colodeless blood ooepusolbs. 



AMCEB.E — Habitat — Movements — Structure — Chemical composition — 

 Effects of temperature and electric shocks — Encystation — Coloueless blood 

 COKPUSCLES — Movements — Structure — The influence of various reagents on 

 them — Physiology of Amoeba. Laboratory work. . . p. 17 — 23. 



IV. 



Baoteeia. 



Form and structure — Movements — Spirillum volutans — Stationary stage — 

 Zoogloea — Growth in Pasteur's fluid — Relation to putrefaction — Power of 

 resisting desiccation — Laboratory work p. 24 — ^28. 



