1896] TOXIC ACTION OF DISSOLVED SALTS 107 
be settled by testing a solution of potassium bichromate or 
sodium bichromate, in which cases the salts are to a high degree 
dissociated. The cathions are harmless, and consequently the 
concentration limit for the ion Cr,O, can be found. 
37. Curomic acid: (HM Cr.0.) 
(Begun February 1, 5 P.M.) 
Concentration Length Length 
gm. mol, per liter| February 2,.3 P.M Feiss ITA,M euxaies 
s¥00 17.0°" dead 
ee; 5% . 
e200 pie pes 27.0™ alive 
bent 28.0 “ 34.5°% a4 
T2b00 25.0 “ B 
vies 18.0 “ a 
38. Boric AcIp. 
(Begun February 3, 1 p.M.; closed February 4, 10 A.M.) 
Concentration 
gm. mol. per liter Length Remarks 
fs 18.0™™ dead 
Per 16.0 se “ec 
as 16.6" “ 
ig 18.0 “ alive (?) 
so 17.5 “ living (?) 
oan 21.5 “ 
ido 28.5 * apparently normal 
oe 25.0 “ * - 
abo 39.0 ee oe “ 
é “ 
eee 35.0 oa ‘ 
xbo 32.0 “ “ 
. “ee “ 
ek 29.5 ners: 
1e00 29.5 “ ee “ 
vie 22.5 ‘ “ ‘“ 
sano 28.0 ee “ec “cc 
a 
Se 35.0 “ oe 
saon 30.5 ‘ee ee eo 
ee a 39.5 “ faa 
Boric acid solutions are poor conductors of electricity. The 
acd is then but very slightly dissociated. Experiments on this 
acid seemed desirable since it is used so much as an antiseptic. 
2 See Ostwald, Zeitschr. f. physik. Chem. 2:78. 
