Review of Recent Geological Literature. 57 
The Journal of Morphology announces the forthcomins volume v to 
contain among other articles, two by Prof. Scott of Princeton "On the 
Osteology of Poebrotherium " and " A Contribution to the Phyllogeny 
of the Tylopoda." 
An Introduction to the Study of Mammals, Living and Extinct. By 
William H. Flowek, C. B., F. R. S., etc., and Richard Lydekkek, 
B. A., F. G. S., London, Adam and Charles Black, 1891, pp. xvi+763. 
Aids in Practical Oeology. By Grenville A. J. Cole, F. G. S. pp. 
xiv+402, London: Griffin & Co.; Philadelphia, J. B. Lippencott Co. 1891. 
Beitrdge zur Geologic und Paldontologie der Republik Mexico. Von 
Dr. J. Felix und Dr. H. Lenk. I Theil, se. 114. Leipzig: Arthur 
Felix. 
Fossil Insects of North America. By Samuel H. Scudder. Vol. I, 
Pretertiary pp. x-)-43.5, 34 plates and Vol. II Tertiary, pp. 743, 28 plates. 
New York: Macmillian & Co. 1891. 
A Catalogiie of British Fossil Vertebrata. By A. S. Woodward, F. 
O. S., and C. D. Sherborx, F. G. S. pp.396. London: Dulau & Co. 
1891. 
Tables for the determination of minerals by their physical properties, as- 
aeitainable with the aid of a few field instruments, based on the system of 
Prof. Dr. Weisbacil By Persifor Frazer ; Third edition, entirely 
rewritten. 12 mo. 115 pages. 1891. J. B. Lippincott Company, Phila- 
delphia. 
Irrespective of the contents of this little volume, its external appear- 
ance invites to its careful examination. It is bound in flexible-leather 
cover, presenting the impression of a handy and durable vademecum for 
the actual student of minerals. More restricted in its scope than the 
" Determinative mineralogy and Blowpipe " of Brush, the " Rock-form- 
ing minerals" of Rutley, and the "Practical Guide to the determination 
of minerals by the blowpipe," of Fuchs, it has a definite purpose which 
is not deviated, from and which brings it into the curriculum of almost 
daily necessities of the young field-geologist. By their metallic lustre, or 
their want of it, all minerals are here classified, there being an inter- 
mediate class having a "sub-metallic and non-metallic lustre." Those 
with metallic lustre are separated by their color at once into red, yellow, 
white, gray and black. The intermediate class is again divided accord- 
ing to their streak, whether it be black, brown, red, yellow, green or 
blue. Those with non-metallic lustre and a light streak are separated 
into five parts, viz: very sectile, sectile, semi-hard, hard and very hard. 
In this last group evidently fall the great mass of rock-forming and as- 
sociated minerals, and here the value and aptness of the short descrip- 
tions of the double pages, arranged in columns,at once become apparent. 
With a small kit of simple apparatus, and by the aid of these distinc- 
tions, there may be made at least preliminary determinations of nearly 
all the minerals which the geologist may encounter. 
