1 88 1.] 
Analyses of Books. 
239 
the more intense ; its disappearance was accompanied by a sub- 
sidence of the land amounting to several thousand feet. 
The aborigines of these islands bear the name of Haidas. 
They possess remarkably fair skins as compared with other 
Indian tribes. They are rapidly decreasing in number, owing to 
the introduction of European diseases. 
As an Appendix to this report we find a catalogue of the 
plants and the marine invertebrate animals observed by the 
explorers. 
The next following report treats of the Churchill and Nelson 
Rivers, and of the region around the God’s and the Island Lakes. 
The surveyor, Dr. R. Bell, has made extensive botanical and 
zoological collections. 
The water of the River Assiniboine, which may possibly be 
used for the supply of the rising city of Winnipeg, contains 
much sulphate of magnesia. It is proposed to remove this objec- 
tionable ingredient by treatment with wood ashes. “ In this way 
salubrious salt, the sulphate of potash, would be substituted.” 
We strongly doubt whether the continued introduction of sul- 
phate of potash into the system would not prove injurious. The 
author lays down the northern limits of the commoner forest 
trees in the country to the east of Hudson’s Bay. 
The inseCt-fauna is decidedly boreal in its character, and in- 
cludes several European species, not forgetting the cosmopolitan 
Cynthia Cardui , No lamellicorn beetle is recorded. 
Memoirs of the Geological Survey of India. Palaeontologia 
Indica. Ser. X. Indian Tertiary amd Post-Tertiary Verte- 
brata. Vol. I., Part IV. Supplement to Orania and Rumi- 
nants. By R. Lydekker. Calcutta ; Geological Survey 
Office. London : Trubner and Co. 
The author finds that the characters which induced him to sepa- 
rate the genera Hemibos , Amphibos } and Peribos are insufficient, 
and he consequently reunites them. 
Vol. I., Part V. Siwalik and Narbada Proboscidea. By R. 
Lydekker. 
This volume deals with the families Dinotheridae and Elephant- 
ids. The former, now totally extinCt, is characterised by the 
permanent dentition being in use at the same time, the second 
true molar having one ridge less than the preceding tooth. The 
genus Dinotherium , the only one of the family, makes an ap 
proach in the form of its cranium to some of the Sirenia , 
