BOOK NOTES

1. PATTERNS FROM NATURE. Photographs by H. P. Horst, J. J. Augustin, New York, 1946, xii & 108 p. $10.00.
2. FORAMINIFERA, Their Classification and Economic Use. Third edition, revised and enlarged, with illustrations and an illustrated key to the genera. By Joseph A. Cushman, Cambridge, Mass. Harvard Univ. Press, 1940. vii p., 535 p. incl. illus., 79 pl. diagrs., Bibliography: p. 335-394. $6.00.
3. PURE CULTURES OF ALGAE: Their Preparation and Main Tenance by E. G. Pringsheim University Press. Cambridge, 1946. xii & 119 p. $1.75

TIMELY WORDS

---- it is far better for anyone who is merely interested in the wonderful and varied forms of living things to be seen between tide marks to seek themout and to watch, and then to leave them behind in their natural haunts. There is much to be seen and learnt by quietly watching by the side of a rock pool or by taking note of the way in which the different species are distributed over the shore. .....The amateur marine naturalist can enjoy to the full many hours on the shore without ever needing to take away with him the animals he has observed." p. 44 in "They Live in the Sea" by Douglas P. Wilson, Collins, London, 12 s. 6 d, 128 pp., ill. 1947. The book is a collection of excellent photographs with an accompanying text.

ATMOSPHERIC PRESSURE

At sea-level, the pressure of the atmosphere is found to be 14.7 lbs. per square inch or 1033.6 gms.per sq. cm. Roughly speaking, this we may say is equal to 15 lbs. per sq. in. or 1 kg. per sq. cm. This pressure is termed one atmosphere.