MICROSPORIDIA 347 



16) Problems of autoinfection. As to whether the spores 

 can germinate in the same host animal in which they were pro- 

 duced, there is no precise experimental evidence. Zander and 

 Fantham and Porter held that autoinfection of Nosema apis 

 occurs in the infected honey-bee. On the other hand, Trappmann 

 (1926) considers that the spores which were set free by the 

 disintegration of extruded infected gut cell are not mature and 

 do not germinate in the same host. With regard to Nosema 

 homhycis, Kudo (1916) held that autoinfection through spore 

 takes place, while Stempell (1909) maintained a contrary view. 

 Paillot (1918), Mattes (1928) and others seem to consider that 

 autoinfection probably takes place in the forms they studied. 



17) Specific host-parasite relation. We possess a rather meager 

 information on this problem, a summary of which will be found 

 in Kudo (1924). 



18) Problems concerning the seasonal occurrence. A few in- 

 vestigators only were fortunate enough to continue observations 

 throughout the year and at present data are too inadequate to draw 

 any conclusions (Kudo, 1924). 



In the bibliography, references which appear in Kudo (1924) 

 are omitted. 



