PROF. PERCIVAL has long been known as an able student of wheat, and an assiduous collector of its different varieties. He has not been content with obtaining ears as herbarium specimens, but has grown them so that he could study their habits of growth and compare them when placed under similar conditions. The work was at first arduous and discouraging: an older generation of Wye College students remembers him rising at 4 a.m. on summer mornings to keep the sparrows off his ripening corn. But he con tinued undaunted, and as a result has produced in succession sets of a remarkably extensive collection of wheat varieties suitable for colleges, a monograph which has now become the standard one on the subject, and this book which, though small in size, is packed with interesting information and is very fully illustrated. Wheat in Great Britain. By Dr. John Percival. Pp. 125 + 63 plates. (Reading: The Author, Leighton, Shinfield, 1934.) 10s. 6d.