1896 | 
tot 
I. 
TOXIC ACTION OF DISSOLVED SALTS 
HypROCHLORIC ACID. 
(Concentration : 
xstoo gm. mol. per liter.) 
MARCH 14, II A.M. 
March 14, 3 P.M. 
zo" UC; 
March 15, 10 A.M, 
22°C, 
March 16. 9: 30 A.M. 
an Cy 
March 17, 11 A.M. 
aa" Ue 
March 19, 3 P.M. 
20° C, 
phy 7A gad 2.9™m 25,000" I 2,gmm 4 I .omm I 2.9mm 5 i: cum 1:50" vee 20,50" 
ma ge (436%. 13.5. | 50.0%: 18.0" [66.0% -160- ags. 25S 
18.5 . a5" -l200° 10.5% | 39.0% 100% [50.0% ie gee” geo” 
17.5 2.5 1 24.0 65° pas 4% -ato 2c oe FS70 5. the" 
Av. growth per 
6.720" 
Ay. growth per 
br.6.56°" 
i 
Ay. growth per 
hr. 0.50™" 
Av. growth per 
br 0.527 
Av. growth per 
br 0.35"" 
12. POTASSIUM HYDROXIDE (KOH). 
(Begun January 9, 9 P.M., closed January 10, 4 P.M.) 
oncentration 
gm. mol, per liter Length Remarks 
zbo0 165°" rather transparent—-alive(?) 
oes ae 17 5 “e “ee “ “cc ? 
abo 27.01" apparently normal—alive 
reid 28.0 * “ec 2 ‘“ és 
sou 36 o * “ sc “ 
ie00 32.0 ‘“ ‘ rT) ‘6 
guoa 42 re) ee “ ad “ee 
sato0 37.5 66 6 «“ ‘“ 
The above table for potassium hydroxide shows that the 
seedlings plainly live when the solution contains ;}, gm. mol. 
per liter, The potassium hydroxide used was free from carbon- 
dioxide at the beginning of the experiment, but of course the 
Solution absorbed the carbon-dioxide given off by the plant as 
well as some from the air during the progress of the experiment, 
so that the hydroxyl ion is to be regarded as somewhat more 
Polsonous than the above figures would indicate. 
Tables 13 to 15 show that in case of the three copper salts 
u vestigated, the strength of the solution in which the seedlings 
hy Just survive is 5,45 gm. mol. per liter. As these salts can 
eee as practically completely dissociated - at this Ses 
, and as they act alike, it is evident that this figure gives 
SO cae the tables of the electrical conductivity of copper salts collected by Ost- 
rbuch d. allgem. Chem., 2:770[ed.2]. The electrical conductivity of 
