112 BOTANICAL GAZETTE [AUGUST 
lactic acid, so a greater toxic effect would be expected from the 
former than from, the latter considering only the concentration 
of the hydrogen ions. A comparison of tables 47 and 48 shows 
that glycollic acid does have a greater poisonous action. 
47. GLYCOLLIC ACID. 
(Begun January 28, 5 P.M.; closed January 29, 9 A.M.) ; 
Geek per ber en wpe 
3200 19.0%" dead 
seer 16.5" mn 
eao0 22,0 “ alive 
sees og Ba as 
————$————— 
48. Lactic ACID. 
(Begun January 28, 6 P.M.) 
Concentration Length Length 
gm. mol. per liter) Jan’y 29,9 a.m, | Jan’y = 4 P.M. — 
Bc eS Pee 
00 18.0™™ flabby, dea 
iu 17.0 - ae 
salvo dt.0 * yee 
ae 0 te OS 2 ee alive 
eto0 6.5 “* 
suis aa.6 * i 
Tho 29.0 “ . 
: os results obtained from the three chlor-acetic acids 
Siven in tables 49 to 51. At the concentration in which 
lupines survive these acids are all practically completely # 
sociated. The mono- and di-chlor-acetic acids yield the 
concentration for hydrogen ions, namely, gzy0 gm. mol. pet h : 
Tri-chlor-acetic acid as well Se ious hvom-acetic aaa ae kill 
seedlings at this concentration. This fact shows that a 
ag which can of course be determined by investigati 
-. lum salts of the acids in question. That amido-proP i 
acid (table 53) has no poisonous action at the concentté 
