SCIENCE—ADVERTISEMENTS 



NEW VOLUMES 



in the Series of 



McGraw-Hili Agricultural and 

 Biological Publications 



(Dr. Charles V. Piper, Consulting Editor) 



Sharp-- 



AN INTRODUCTION TO CYTOLOGY. 



By Lester W. Sharp, Assistant Professor of Botany, Cornell University. 

 452 pages, 6 X g, 159 illustrations, $4.00. 



A book for students of the biological sciences who desire a means of becoming more readily 

 acquainted with the literature and problems of cytology. 



Throughout the book attention is focussed upon the protoplast; the cell wall is given only 

 brief consideration, since it plays a relatively minor role in the processes of particular interest 

 to the cytologist at the present time. Because of their fundamental importance in connection 

 with the problems confronting the geneticist, the phenomena of nuclear division, chromosome 

 reduction, and fertilization are described with considerable fullness, and their relation to the 

 problems of heredity is taken up in five special chapters. 



Hayes and Garber — 

 BREEDING CROP PLANTS 



By Herbert K. Hayes, Professor of Plant Breeding, University of Minnesota and Ralph J. 



Garber, Associate Professor and Head of the Department of Agronomy, University of 



West Virginia. 



jzS pages, 6 x g, 63 illustrations, $3.50. 



This is the first text in English which summarizes in the light of present knowledge the 

 mode of inheritance of important botanical and economic characters of crop plants. The history 

 of plant breeding, the botany of crop plants, the value and application of genetics to crop im- 

 provement and the methods used in producing many of our improved varieties are used as a 

 basis for the development of what now appears to be a correct plant breeding technic. 



Fern aid— 



APPLIED ENTOMOLOGY 



By H. T. Fernald, Professor of Entomology, Mass. Agricultural College. 

 386 pages, 6 X g, 388 illustrations, $3.50. 



An introductory textbook of insects in their relation to man. 



It gives a genera! idea of insects, their structure, life histories and habits, with methods 

 for the control of insect pests in general, followed by a more thorough study of the more important 

 ones found in this country. 



Send for copies of these new books on approval 



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 370 Seventh Avenue NEW YORK 



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