td by permission of " The 

 Qmtrl. Jour >. 



\l \ I. AM HI 



(Vcr>' highly magnified.) 

 The microscopic animal Trypano- 

 omr . which causes Sleeping Sickness. 

 The study of these organisms has of 

 Ute yean acquired an immense impor- 

 tance on account of the widespread 

 and dangerous maladies to which some 

 of them give rise. It lives in the 

 blood of man, who is infected by the 

 bite of a Tse-tse fly which carries the 

 parasite from some other host. 



VOL VOX 



The Volvox is found in some canals and the like. It is one of the first animals 

 to suggest the beginning of a body. It is a colony of a thousand or even ten 

 thousand cells, but they are all cells of one kind. In multicellular animals the 

 cells are of different kinds with different functions. Each of the ordinary 

 cells (marked 5) has two lashes or flagella. Daughter colonies inside the 

 Parent colony are being formed at 3 ,4. and 2. The development of germ-cells 

 is shown at i. 



PROTEROSPONGIA 



One of the simplest multicellular animals, illustrating the begin- 

 ning of a body. There is a setting apart of egg-cells and sperm- 

 cetU, distinct from body -cells; the collared lashed cells on the 

 margin are different in kind from those farther in. Thus, as in 

 indubitable multicellular animals, division of labour has begun. 



