1896 | TOXIC ACTION OF DISSOLVED SALTS 103 
29. MERCURIC CHLORIDE-+DEXTRINE+CAUSTIC POTASH. 
The detailed record having been mislaid, the end results are here given. 
(Concentrations calculated on the mercuric chloride.) 
Concentration 
gm, mol, per liter Result 
died 
= | Om 
te a Se 
BSS S235. 
Saqgqgt*a 4 
a 
_ 
= 
2s 
ao 
joey 
30. Mercuric cyAniDE (HgCN,). 
(Begun February 25, 5 p.M.; closed February 26, 3 P.M.) 
Concentration : . 
gm, mol, per liter Length Remarks 
zst00 24.0%" transparent in growing parts, dead 
4 P g 
+8 6 Oe > 28.5 ‘ ‘“ 66 ‘és “ 
31300 255 dead 
Weak py 30 fe} “ec it 
1oz400 45.0 “ alive 
1otEen 44.0 “ “ 
00 45.0 oe “ 
BrvE00 44.0 “ “ 
6 eh aw 46 fe} “ ce 
EES SE 
Mercuric cyanide solutions possess no measurable electrical 
conductivity, This compound is then practically not dissociated 
In Hs solutions. Its toxic effect is consequently due to the 
undissociated salt (HgCN,) in the solution. The fact that the 
roots can bear only tuzr00 gm. mol. per liter of this substance 
Speaks for its pronounced poisonous character. 
In tables 31 and 32 are the results obtained with solutions 
of Silver nitrate and silver sulfate respectively. That these solu- 
tions behave alike toward the lupines is again evidence that it is 
= the silver ions they contain that are active. Their extremely 
Polsonous character will be noted. They are the most poisonous 
lons that we have investigated. 
