9 



Table No. 3. 

 Effect of carbohydrates on the production of indol. 



The table shows that the production of indol takes place in the 

 presence of peptone solution, glycerin, lactose, and starch ; but saccharose 

 and dextrose inhibit its production. In a second series of experiments 

 B. coli and Prot. vulgaris were used for inoculation. The solutions 

 were made up as in the first experiment and at the end of four days 

 all the flasks were titrated against n/10 NaOH. The results are given 

 in Table No. 4. 



Table No. 4. 

 Effect of carbohydrates on the production of indol. 



The results indicate that in each case where acid is produced by 

 the organism, there is an inhibition of indol production. Lactose, which 



1) (I) doubtful. 



