st Rk. H. Lee—Atomie Weights of Cobalt and Nickel. 
a transverse pair, and are not oblique as in the larger species. — 
e posterior pair of tubercles, also, are nearly on a transverse 7 
ne. q 
Measurements. 
Length of fragment of lower jaw, enclosing last premo- 4 
ar and three molars, _------. 75 lines. 
Antero-posterior diameter 0 e second lower molar, ----- o-  6 oe 
Transverse duimeter of fanic,. <5. 5 a. css a ea 
The only ao Spo of this species now known were ~ 
found by the writer at Grizzly Buttes, near the base of the 
Uintah Mountains, in Wyoming. 4 
Yale College, New Haven, June 5th, 1871. 
Art. [X.—Contributions to Chemistry “aioe the Laboratory of the 
Lawrence Scientific School. No. 16.—On the Atomic Weights 
of Cobalt and Nickel; by RicHarp H. ee 
THE atomic weights df cobalt and nickel have long been sub- 
jects of controversy, but though much time and labor have been 
spent upon them, the results arrived at are not as satisfactory as_ 
could be desired. 
Under these circumstances Prof. Gibbs suggested to me a 
— ee of the subject. — 
oo and results, I wi 
on and as but a aes Pet at 
sions : neue can hardly be soumdoned as deserving 0 
confiden 
Ld Poses haaiee vol. viii, p. 194-5. 
— der Pharmacie, vol. xxxii, p. 76. 
} Poggendorff’s Annalen, ci, p. 387. : 
