368 Reviews—Geological Survey of Canada. 
‘Mica Traps.’ The nepheline rocks of course can only be illustrated 
by the well-known example from the Wolf Rock, and for a leucite 
rock the author has had to go beyond the limits of the British 
Isles. Here we think a better example might have been found for 
figuring than that which he has selected. The principal types, 
however, are all briefly described in the text. There is an excellent 
chapter on Contact Metamorphism, and that which follows, on the 
origin of Igneous rocks, is one of the most valuable in the book; for 
it contains a discussion of the experiments by the late lamented 
Prof. Guthrie, on eutectic solutions, and of the no less important 
researches of Lagorio on the crystallization of minerals out of 
igneous magmas. The work concludes with a discussion of the 
metamorphoses and destruction of Igneous rocks, which is to some 
extent a summary of questions touched upon in the body of the 
work. Dr. Hatch has contributed a glossary of terms used in 
describing rocks, for which also the student should be duly grateful, 
as its compilation must have cost much labour of a rather dull kind. 
We have not attempted to give a full summary of this admirable 
work. Its 422 large octavo pages are so replete with valuable 
matter, that this would be impossible, and we have no disposition to 
save the student from the labour, no less profitable than pleasant, of 
reading the book. It is one which every geologist who desires 
accurate information on the structure of our igneous rocks should 
have upon his shelves. We have frankly ventured one or two 
small criticisms, but we wish it to be understood that these relate 
in the main to questions where, doubtless, the personal equation 
come in, with the reviewer as well as with the author—and conclude 
by no less frankly asserting that it bears on every page testimony of 
the most conscientious labour, and is not only a careful compilation, but 
also full of the results of original research. Knowing well Mr. Teall’s 
abilities and learning, we had expected much, but we have found 
more. Henceforth he will hold a place in the foremost rank not 
only of petrographers but also of petrologists. T. G. B. 
IJ.—Rerort on a Part or NortrHErRN ALBERTA, AND PoRTIONS 
or Apgacent Districts or ASSINIBOIA AND SASKATCHEWAN. 
By J. B. Tyrrett, B.A., F.G.S.; pp 1 E to 176 E, with Appen- 
dices i—iv and two Maps. (Geological and Natural History 
Survey of Canada, Part E, Annual Report for 1886; Montreal, 
1887.) 
oh this report Mr Tyrrell furnishes us with an account of the 
geology and natural resources of the tract surveyed and points 
out the “extent, position and character” of its mineral deposits. 
I'he country traversed “lies between the 51st and 54th parallels of 
North latitude, from longitude 110° to 115° 15’ west, including an 
area of over 45,000 square miles.” The author begins (p. 7 E) with 
a brief history of former explorations, among which the most im- 
portant of the earlier ones was that carried out by Captain Palliser, 
with Dr. Hector as Geologist (1857-1859). These pioneer explorers 
were followed by many others, some of whom, like Milton and 
