562 Reviews — Boulger's Elementary Geology. 



The igneous rocks include portions of the granite-mass of Cairn* 

 gorm on the south of the area, and large tracts of diorite, epidiorite, 



and hornblende-schist in the eastern portion of the area, at Kirkton 

 of Glenbueket, etc. Serpentine also occurs. 



Among the economic products, building- and paving-stone is 

 obtained from the Old Eed Sandstone, and lime for agricultural 

 purposes from the limestone. Iron-ore has been smelted at Nethy 

 Bridge, and manganese-ore was formerly obtained. Diatomite occurs 

 in places, and veins of plumbago have been met with. A few 

 mineral wells are recorded. 



In his petrographical notes, Mr. Teall notes the occurrence of 

 zircon, rutile, and ilmenite in the rocks of the Cromdale Hills; and 

 he calls attention to the abundance of cordierite in the nietamorphic 

 rocks. Interesting particulars are given of the structure of both 

 metamorphic and igneous rocks. 



The absence of a small index to this work is to be regretted, and 

 it should be mentioned that the type is not so clear nor the paper 

 so gcod as in the previously published explanation of Sheet 5. 



II.— Elementary Geology. By G. S. Boulger, F.L.S., F.G.S., 

 Professor of Geology, City of London College. Small 8vo, 

 180 pages, with woodcuts. Price Is. 6d (Collins and Co. : London 

 and Glasgow. Not dated. ) 



THIS is a revised edition of the late Dr. W. S. Davis's little intro- 

 ductory handbook of Geology. The principles of Geology, and 

 their illustration by reference to main facts concerning the past 

 and present conditions of the earth, are systematically and 

 successively stated in twenty short chapters, concisely written, and 

 illustrated with the woodcuts usually met with in such geological 

 handbooks. 



The author avoids, to a great extent, entering into disputed and 

 hypothetical explanations of natural facts. He is clear in his 

 statements, though brief; and has evidently the experience of 

 a sound and practical teacher. 



The plan of the book is good for a young earnest geologist, who, 

 seeking for visual evidences, in quarries and cliffs, as well as in 

 museums, will take the successive chapters as leaders for his 

 notebook and method of study. For amateurs this little book of 

 elements can be recommended as opening a way of beginning to 

 learn the subject systematically. 



The author has especially in view the aid that can be given to 

 candidates in geological examinations, and he reprints the questions 

 given in "Science and Art" examinations in 1889-96, and 183 

 questions taken from other sources, with references to the cor- 

 relative paragraphs in the book. 



A good Index completes this well-printed and recommendable 

 little handbook. 



