Inheritance in Single Bacterial Cells 



67 



Now taking the action of penicillin first, Fig. 6 shows a 

 group of organisms transferred to penicillin-agar. Just as the 

 morphological effect of the drug varies with concentration, so 

 if the concentration is kept constant individual cells in a 

 culture will be influenced differently. The cell on the right of 



m 



I 





rp^^irp 



'iW^ ^A^^ 



Key . 



(K Long form alive A L°"g ^^^'^ ^^^^ • ^° growth, autolysed 



Fig. 7. The effect of 10 u. penicillin /ml. on the individual cells of nine micro- 

 cultures, grown from nine members of a clone of sixteen cells. (Hughes W. H. 

 (19556), J. gen. Microbiol., 12, 269.) 



