1915] 



MERRILL ELECTROLYTIC DETERMINATION OF EXOSMOSIS 



547 



concentration sufficiently effective to give results in a short 

 interval of time. After the treatment the roots were rinsed 

 and placed in distilled water. It is interesting to note that 

 the alcohols used were only slowly effective at first, but that 



TABLE VI 



CONDITION OF PLANTS AFTER TREATMENT WITH ANESTHETICS 



Culture no. 



Condition of tops 



Condition of roots 



Condition of plants 2 days after treatment: 



3 and 4 

 5 

 6 



7 



8 

 9, 10, 11, and 12 



13 



14 



16, 17, and 18 



Slightly subnormal, but almost normal 

 Practically same as in Nos. 3 and 4 . . 

 Practically same as in Nos. 3 and 4 . . 



Practically all dead 



Almost normal 



Normal 



Normal 



Normal 



Normal 



Somewhat flaccid 

 Practically normal 

 Practically normal, but 



somewhat flaccid 

 Somewhat flaccid 

 Slightly flaccid 

 Considerably flaccid 

 Practically normal 

 Slightly flaccid 

 Normal 



Condition of plants 9 days after treatment: 



3 

 4 

 5 

 6 

 7 

 8 

 9 

 10 

 11 and 

 13 and 

 16 

 17 and 



Much dried and yellowed. . . 

 Slightly worse than in No. 3 

 Same as in No. 4 



12 

 14 



18 



Mostly dried up. . 



All dried up 



Practically normal 

 Practically normal 

 Practically normal 

 Almost normal. . . . 



Normal 



Slightly subnormal 

 Normal 



Practically normal 

 Considerably flaccid 

 Less flaccid than in No 

 Practically normal 

 Slightly flaccid 

 Practically normal 

 Considerably flaccid 

 Somewhat flaccid 

 Somewhat flaccid 

 Practically normal 

 Practically normal 

 Normal 



4 



after 8 days the conductivity readings for those cultures were 

 as high as those of the other cultures. Benzol and toluene 

 produced almost identical effects. The effect produced by 

 chloral hydrate remained constant after 1 day. Ethyl acetate 

 and benzaldehyde were especially effective. The condition of 

 the plants at the end of 8 days is given in table vii. 



In fig. 14 are shown the effects of smaller amounts of the 

 same substances, the curves of which are exhibited in fig. 13. 



only one-fourth as great as 



Here 



concentrations 



those previously employed were used, but the chemicals were 

 allowed to remain in the water during the entire period (or 

 until evaporated, as may have been the case with some). 



While the alcohols gave a greater effect than the control, 

 they gave no greater exosmosis than one of the controls in the 



