118 BOTANICAL GAZETTE [ AUGUST 
acid is what one would have expected it to be from the concen 
tration of the hydrogen ions in this solution. 
63. Cirric ACID. 
(Begun January 24, 9 P.M.; closed January 25, 4 P.M.) 
Concentration Length Remarks 
gm. equiv. per liter 
800 17.0m™ dead 
fe is 3 
soo Plat? ab living 
ee 20.0 “ is 
e400 27.5 “ : 
eink 26.0 “ % 
rBh00 28.5 “ 
ac. 26.0 “ a 
The poisonous action of eleven acids of the aromatic series 
has been determined. The acids of this series are of special 
interest, for the undissociated molecules as well as the anions In 
nearly all cases possess a distinct toxic action of their own, ev 
at great dilutions. 
64. BENZOIC ACID. 
(Begun January 14, 8 P.M.) 
Concentration Len: 
) gth Length 
gm. mol. per liter | January 15,9 A.M. | January 15, 6 P.M. Remarks 
a ae 
s200 20.0™™ dead 
Per ae 18.0 “ “cr 
e400 22.5 “ 24.0%" living 
ee yw 24.0 “ 27.0 “cc “ 
tabo0 26.5 “ 29.0 ‘“ 
23.0 “ a0 * 33 
eae 
65. Hippuric ACID. 
(Begun January 23, 9 P.M.; closed January 24, I2 M-) 
Concentrati 
gm. mol. ee ine Length Remarks 
“sto 20.5mm dead 
+ 6 6 20.0 “a “ 
eto 26.5 “ alive 
ae ee 24.5 ae +e 
tuber 28.5 “ “6 
