HOW TO INCREASE THE FOOD SUPPLY 



Every Farmer, Stock-beeper and Gardener should consult 



THE FARMERS' ANNUAL 



and 



REGISTER OF AGRICULTURAL AND 

 HORTICULTURAL EXPERIMENTS 



Edited by J. W. HUKST 



A genera] giiide to the whole experimental work of the Country, giving a detailed 

 resume of actxial tests in connection with the following important subjects : 

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FODDER CROPS GENERAL CROPS LIVE STOCK 



DAIRY PRODUCE PESTS AND DISEASES HORTICULTURE 



FORESTRY etc. 



AN ENCYCLOPAEDIA of useful and up-to-date information tabulated for 

 easy reference. 



LISTS of NEW SEEDS and PLANTS. IMPLEMENTS. 



BOOKS OF THE YEAR. REPORTS and other PUBLICATIONS. 



STATISTICAL and other useful and indispensable information. 

 1915 Edition NOW READY 

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THE UNIVERSITY OF CHICAGO PRESS 



The Evolution of Sex in Plants. (The University of Chicago 



Science Series.) By John Merle CIoulteij, Head of the Department of Botany in 



the University of Chicago. 



In this first Tolurae of the new "University of Chicago Science Series" Professor 



Coulter, the editor of the BotanicalOazette and the author of numerous volumes on botanical 



science, has given a presentation of the results of research sho\ving that all reproduction 



is the same in its essential features and all methods of reproduction are natural responses 



to the varying conditions encountered by plants in theii' life-histories. Sex reproduction,^ 



the author says, is simply one kind of response, the sex feature not being essential to 



reproduction, but securing something in ooimection with the process. Various phases of 



the subject discussed include the evolution of sex organs, the alternation of generations, 



the difierentiation of sexual individuals, and parthenogenesis. The last chapter, which 



offers a theory of sex, reviews the more prominent facts set forth in preceding parts of 



the volume, and serves both as a summary and a working hypothesis. 



In preparation for early publication in the same series with Professor Coulter's book 

 are voltunes on The Origin of the Earth, by Professor Thomas C. Chamberlin, Head of the 

 Department of Geology, and The Isolation and Measurement of the Electron, by Professor 

 Robert Andrews MilUkan, of the Department of Physics, viii + 140 pages, small 12mo, 

 cloth, 48 net. 



The Botanical Gazette. Edited by John Merle Coultee, Head of 

 the Department of Botany in the University of Chicago, with the assistance of other 

 members of the botam'eal staff. 



A monthly journal embracing all departments of botanical science. 



Volume LIX began with the January 1915 number. 



Subscription price, £1 128 6d ; single copies, Ss 3d. 



The Cambridge University Press 



Agents for the British Empire 



London, Fetter Lane 



