34 J. Wyman on the Engeé-ena. 
* prism, and the other a very deeply modified variety of the same. 
These crystals have the changeable purple color peculiar to the 
salts of chrome, and their solution in water is of the same hue 
while cold, but becomes green when heated.. 
This salt fused at about 98° F. into a deep green fluid, which 
began to assume the solid state when cooled to 75°, the ther- 
mometer rising thereupon to 96°. If heated to redness, it under- 
goes complete decomposition, leaving a bulky oxyd of a beauti- 
ful nee color. 
composition of nitrate of chrome was found by analysis 
to rai nitric acid 39: 7 p.c., oxyd of chrome 19 p.c. Calculation 
=! 
> 
from the formula N, C1+18H, gives: nitric acid 40-44, sesqui- 
oxyd of chrome 19: 13, water 40-43. 
No experiments have been made on the basic salts. 
Roxbury, Mass., Oct. Ist, 1849. 
Arr. VII[._—A description of two additional Crania, of the En- 
gé-ena, ( Troglodytes gorilla, Savage,) from Gaboon, Africa ; 
y Jerrries Wyman, M 
“Rend before the Boston Society of Natural History, Oct. 8d, 1849. 
ime evillenes now existing of a second and gigantic African 
species of man-like ape, as appears from published reports, con- 
sists of the following remains :—1. Four crania in the United 
States, two males and two females, of a large portion of a male 
skeleton, and of the pelvis and of some of the bones of a female. 
hese were the first remains of this animal which had been 
brought to the notice of naturalists, and were described in the 
Boston Journal of Natural History.*—2. Three other crania sub- 
sequently discovered exist in — ‘and have been made the 
subject of an elaborate memoir by Prof. Owen, in the Transactions 
of the Zoological Society of London.t—3. Quite recently, Dr. 
George A. Perkins, for many years an able and devoted laborer in 
the Missionary enterprise at Cape Palmas, W. Africa, has brought 
to the United States, two additional crania, one of which is depos- 
ited in the Museum of this Society, and the other i in that ao eo 
* See Proceedings of the Boston Soc. Nat. Hist., Aug. qs 1847 ‘ao a ele 
scrip- 
tion of characters and habits of stage are? gorilla, by Thom avage, M.D., 
ya Memb, Bost. Soc. Nat. His “ and 0 Ostoology of the oti by Jeffries 
Wyman, M.D., Bostc nm Journ. Nat. ist., we 
Osteologial nama to Re Natural | ikiory' ‘f ae Siete one ( Troglo- 
a large s 
off,) in cluding the description of the skull species, (7. gorilla, 
nie discovered by Thomas 8. age, M.D, i “thy Gabon gy West 
by Prof. Owen, F.RS., &e, Read Feb. 22, 1 Zoolog. Society of 
25, 
Vol. iii, p. 381, 1849, 
