Effect of Chemicals on Growth 



513 



Effect of Nicotine on Growing Paramecia 



Growth in 1-2,^00 nicotine. Growth in nicotine was measured 

 directly in the way previously described (page 491). One of the 

 two products of fission was placed in pure hay infusion, the other 

 in|hay infusion containing nicotine. In a solution of i part of 

 nicotine to 2,500 of hay infusion, the results are as shown in 

 table XIX. 



TABLE XIX 



Measurements of growth in 1-2,^00 nicotine. 



TABLE XX 



Measurements of growth in 1-^,000 nicotine. 



