100 BOTANICAL GAZETTE [AUGUST 
22. NICKELOUS NITRATE (Ni(NO,) 9). 
(Begun March 20, 4 P.M.) 
Concentration Length | Length 
gm. mol, per liter|March 21, ro 2 March 23, 3 P.M. Remarks 
ee 
a5800 26.0™™ 26.5™™ dead 
ie ae 20.0 ** 20.0 “* “ 
sihoo 28.0 “ 28.0 “ “ 
ee 37.0 “ 45.0 “ “liv. Mar. 21 
23. CoBALTOUS SULFATE (CoSO,). 
(Begun March 20, 3 P.M.) 
Concentration Length Length me 
gm, mol, per liter|March 21, 10 A.M.| March 23, 3 P.M. Remaree 
poceoere 
Taboo 2.07% I9.0™™ dead 
re ee va 22.0 “ “ 
35800 23.0 “ a5 % “liv. Mar.2! 
ee ta 27.0 “ 33.0 “ “ec PP aus | “ 
srd00 35.0 “ o2.4.° alive 
35.0 “ 46.0 “ dead, liv. Mar. 21 
na 
24. COBALTOUS NITRATE (Co(NO;) ¢)- 
(Begun November 23, 5 p.M.; closed March 24, 3 P.M.) 
Concentration 
gm. mol, per liter Length Remarks 
ee 
estou 38.0™™ alive 
eae 16.5% dead 
srd00 40.0 “ alive 
Wea aie 28.0 “ “ 
wi (ee 
That cobalt, nickel and iron in the ionic condition thus hat 
the same toxic effect would tend to arouse in the mind 0° 
chemist the question whether this is not connected with 
that these metals have nearly the same atomic weight. Be ‘os 
there is a definite relation between the toxic effects oF the 
of the metals and the atomic weights of the latte? ie 
words whether the periodic law finds application here, is 4 ‘- 
tion that can be answered only after more experiment : 
have been gathered. 
i 
