200 J. W. Dawson—Skeleton of a Whale from Ontario. 
The fact that the beautiful green of chalchuite is the normal 
color of the gem, and that among the ancients, and even so 
recently as the last century, the stones of a green tint were the 
most prized, should lead to a higher appreciation of this gem 
and to its more extended use in jewelry and choice mosaics. 
Mr. C. W. King, in the work already cited, says that the very 
rare antique works in turquois are in the green kind, notably 
the head of Tiberius at Florence in a stone as large as a walnut, 
and other half relief works in green turquois in the Marl- 
borough collection. The chalchuite is well adapted to cameo 
_ or intaglio work, and the color is finer by candle light than by 
sun light and the blue tint is deeper. 
using the name chalchuite instead of the longer form 
“chalchihuil,” as in my former paper, I now follow Bernal 
Diaz, the historian of the conquest of Mexico, rather than 
Mill Rock, New Haven, Conn., Jan. 6, 1883. 
Arr. XX.—On portions of the Skeleton of a Whale from gravel 
on the line of the Canada Pacific Railway, near Smith's Falls, 
Ontario ;* by J. W. Dawson. 
a the Canadian Naturalist; communicated in an advancedgproof byith® 
author. 
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