Bitter Pit in Applet 



395 



different compounds. This is done in the following table, in 

 which the first column gives the poison used, the second the 

 variety of apple, the third the duration of exposure to the 

 poisonous solution, the fourth the lowest concentration at 

 which signs were shown of any distinct poisoning of the pulp 

 cells in prepared apples, and the fifth this concentration in mole- 

 cular equivalents, so that a comparison is possible between the 

 poisonous action of equal number of molecules : — 



*The concentration given is that at which quite a distinct poisonous 

 action is still perceptible, and not that at which it is just fading out, one 

 litre of solution being used to each apple. 



**Estimated from P. O'Gara's analyses of the percentage of arsenic in 

 dead pit tissue produced by arsenate of lead. 



***Estimated from percentage of arsenic present in strongly poisoned 

 tissue. The real limit is probably much lower. 



14a 



