No.411.] REVIEWS OF RECENT LITERATURE. 241 
Kemp’s Handbook of Rocks, for use without the Microscope, 
Second Edition.! — The publication of a new edition of the Hand- 
book of Rocks so soon after the appearance of the first edition is a 
guarantee that the author has furnished a book that has given satis- 
faction to its users. It is the only treatise in English that aims to 
give the student an accurate and scientific knowledge of rock-masses 
without requiring him to master the technique of microscopical 
analysis. The new edition differs from the earlier edition principally 
in the glossary, which has been extended to include the new terms 
proposed by petrographers in the discussions of the past four years. 
The volume is of handy size and is beautifully printed on excellent 
paper. 
Hovelacque’s Photographs of Sedimentary Rocks.? — This album 
consists of sixty-nine plates, presenting microphotographs of thin 
sections of alpine limestones. These photographs were made in the 
course of a full investigation of the so-called “Calcaires du Brian- 
connais," in the French Alps, by Messrs. Killian and Hovelacque, 
who hoped by means of microscopic study to be able to determine 
more accurately the various horizons of the series in the absence of 
available fossils. The work was interrupted by the untimely death 
of Mr. Hovelacque, and this album is a preliminary report present- 
ing his uncompleted work. 
The plates represent a great variety of limestone structures, as 
well as many types of the minute organisms which compose, in large 
part, many of the limestones. Full explanations make each plate 
intelligible, and together they make a valuable addition to our knowl- 
edge of the microscopic petrography of the sedimentary rocks whose 
value will, however, be much enhanced when the fuller report, which 
is promised by M. Killian, makes its appearance. 
1 Kemp, J. F. A Handbook of Rocks, for use without the Microscope. With a 
— af the names of rocks and of other lithological terms. Second edition, 
revised. New York, D. van Nostrand Company, 1900. 185 pp. 
* Killian, W. Album de Microphotographies de Roches Sédimentaires faites par 
Maurice Hovelacque. Paris, Gauthier-Villars, 1900. 14 pp., quarto, 69 plates. 
