PLATE IV. 



Note. — All figures are moist chamber colonies growing in Ashby's agar at 25° C, 

 uniformly magnified 1000 di., Zeiss apochromat. lens, 1-5 mm., Apert. 130, 

 Homog. Irmners., Compens. ocular 6. 



Fig. 1. Young colony of A3, 16 hours after culture was prepared. 

 " 2. Same young colony 24 hrs. after culture was prepared. 

 " 3. " " " 36 " " " " 



.'. A u « u (>r\ a it u u u 



" 5. " " " 84 " 



6. Portion of the edge of a spreading colony 4 days old; granulation and all 

 stages of fission is represented. 



7. A compact colony 4 days after culture was prepared. 



" 8. Motile forms that were observed to break away from a colony and swim 

 around for twenty minutes or so in water of condensation which accumulated 

 at edge of colony; photographed when quiescent. 



Jt2&âm 



~1H 



