PLATE I. 



Fig. 1. Streak culture of Al on Ashby's agar, 10 days at 25° C. Note tendency 

 to flow over surface; brown pigment developing in cloudy streaks. 



" 2. Streak culture of A2 on Ashby's agar, 10 days old at 25° C; dark brown- 

 black pigment rapidly developing; consistency butyrous. 



" 3. Colonies of Al, 3 weeks at 25° C; moist-viscid, pigment brown. 



" 4. Colonies of A2, 3 weeks at 25° C; pasty-viscid, pigment brown. 



.5. Streak culture of A3, 10 days at 25° C; black pigment developing, con- 

 sistency pasty. 



6. Streak culture of A4, 10 days at 25° C; pigment intense black, consistency 

 coriaceous. 



7. Colonies of A3, 3 weeks at 25° C; intense black; pasty. 



8. Colonies of A4, 3 weeks at 25° C. ; intense black; coriaceous. 



(<BF 



i 



