FOOD AND OXYGEN IN CONTROLLING SEX 



123 



TABLE 8 



Bacterial counts showing (1) that in 16 lots out oj 22 lots a 40 to 60 per cent increase 

 in oxygen causes a larger number of bacteria per cubic centimeter than in air, 

 (2) that in 6 lots out of 22 lots a 40 to 60 per cent increase in oxygen causes a 

 smaller number of bacteria per cubic centimeter than in air, (3) that under ap- 

 parently identical conditions the bacterial count in so?ne cultures is increased 

 and in other cultures it is decreased, (4) that in several dishes apparently in- 

 oculated with the same amount of bacterial scum the number of bacteria at the 

 beginning or at the end of the experiment may vary greatly, (5) thai male-pro- 

 ducing females are produced regardless of the number of bacteria present, (6) 

 that male-producing females may be produced regardless of whether air or oxygen 

 in an abundance is present 



FOOD CONDITIONS 



SCUM FROM STABLE TEA 



CULTURE 



i t> W Z k, 



«°23 w 



s h a r h 



g a z « £ z 



a 3 ^ o s 



n « « z « 

 SggSBS 



fa k e. z a 



ogg w S 



a 2 "a 

 B) os b p< 



a z 

 on a 



P s 



SB 

 S 



DAUGHTERS 

 ISOLATED 



99 



0*9 



Per 



cent'of 



d"9 



1 



2< 



3 



24 



24 



24 



24 



24 



24 



24 



cc. of 0.1 per 

 cent bouillon 

 plus scum 46 

 days old 

 cc. of 0.1 per 

 cent bouillon 

 plus scum 46 

 days old 



cc. of 0.1 per 

 cent bouillon 

 plus 1 cc. scum 

 6 days old 

 cc. of 0.1 per 

 cent bouillon 

 plus 1 cc. scum 

 6 days old 



cc. of 0.1 per 

 cent bouillon 

 plus 1 cc. scum 

 6 days old 

 cc. of 0.1 per 

 cent bouillon 

 plus 1 cc. scum 

 6 days old 

 cc. of 0.1 per 

 cent bouillon 

 plus 1 cc. scum 

 6 days old 



Air 



60 per 

 cent 

 oxy- 

 gen 



Air 



60 per 

 cent 

 oxy- 

 gen 



Air 



60 per 

 cent 

 oxy- 

 gen 



Air 



115,000,000 



140,000,000 



13,000,000 



24,000,000 



5,500,000 



9,000,000 



13,000,000 



