GENETICAL CHARACTERS 



11-12 



plates yielded from to 19 large colonies per plate with a back- 

 ground of Tiillions of minute colonies. Fig. 11-6 shows the region 

 around one of the large colonies revealing the enormous number 

 of tiny colonies embedded in the agar. Plating the large colony on 

 galactose agar produced large and small colonies and the large 

 colonies inoculated into Durham tubes filled the inverted insert 



I'l^'. 11-5 (jalartose a;.ar jjour ('late inoculated with 3 , OO'"' , OdO 

 i^lucose f<rowri reils ot a "slow" lertnenter ol galactose. .""tixteen 

 lar^e colonies visible. 



with gas in about 24 hours obviously belonging to what we had called 

 type 1, or rapid fermenters. This is interpreted to mean that the 

 "slow" fermentation in the Durham tube containing nutrient medium 



