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NEW BOOKS. 
The Beginner’s Guide to the Microscope. By Charles E. Heath, 
F.R.M.S. 1922. 120 pp. Published by Percival Marshall 
and Co., 66 Farringdon Street, E.C.4. Price Is. 6d. 
Brown Bast. An Investigation into its Causes and Methods of 
Treatment. By A. R. Sanderson, F.L.S., and H. Sutcliffe, 
A.R.C.Sc., F.R.M.S. 1921. 71 pp. and 26 pis. Published by 
The Rubber Growers’ Association, 2 Idol Lane, E.C.3. 
Considerations sur 1’Etre Vivant. By Charles Janet. 1920 and 1921. 
Part 1 , 80 pp. and 1 pi. Part 2, 196 pp. and 1 pi. Published 
by Imprimerie Dumontier et Hague, 23 Rue Jules-Michelet, 
Beauvais. 
Journal of Scientific Instruments. A monthly publication dealing 
with their principles, construction and use. Preliminary 
Number, May, 1922. Published by the Institute of Physics, 
10 Essex Street, W.C.2. 
Revue d’optique Theorique et Instrumentale. First Number of a 
monthly journal, January, 1922. Published by Librairie 
Chapelot, 136 Boulevard Saint-Germain, Paris. Price fr. 2.50. 
The Geological Work of Charles Lapworth. By W. W. Watts. 1921. 
51 pp. Special Supplement to Yol. XI Y. of the Proceedings of 
the Birmingham Natural History and Philosophical Society. 
Price 2s. 
Foraminifera of the Philippine and Adjacent Seas. By Joseph A. 
Cushman. 1921. 608 pp. and 100 plates. Published by the 
Smithsonian Institute, Washington, U.S.A. 
A Monograph of the Existing Crinoids. Yol. I., The Comatulids, 
Part 2. 1921. xxvi + 795 pp., 57 plates. Published by the 
Smithsonian Institute, Washington, U.S.A. 
Modern Microscopy. A Handbook for Beginners and Students. By 
M. I. Cross and Martin J. Cole. Fifth edition revised and re- 
arranged by Herbert F. Angus, F.R.M.S. 1922. x + 315 pp., 
12 plates, 144 text-figures. Published by Balliere, Tindall and 
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The Free-living Unarmoured Dinoflagellata. By Charles Atwood 
Kofoid and Olive Swezy. 1921. 562 pp., 12 coloured plates, 
388 text-figures. Published by the University of California, 
Berkeley, California. Price 12.50 dollars. 
The Marine Decapod Crustacea of California. By Waldo L. 
Schmitt. 1921. 470 pp., 50 plates, 165 figures in text. 
Published by the University of California Press, Berkeley, 
California. Price 5 dollars. 
Contributions toward a Monograph of the Sucking Lice. Part II. 
By Gordon Floyd Ferris. 1921. 81 pp., 57 text-figures. 
Published by the Stanford University, California. Price 
1 dollar. 
