SCIENCE 



Friday, August 5, 1910 



CONTENTS 

 The Future Wheat Supply of the United 

 States: Professob M. A. Cakleton 161 



Miss Matilda H. Smith: L. 0. H 171 



The Summer Meeting of Section E of the 

 American Association: Db. F. P. Gulliveb 171 



Scientific Notes and Neivs 172 



University and Educational Neics 174 



Discussion and Correspondence: — 



Tlie Bearing of Psychrometer Readings on 

 Measurements of Martian Aqueous Vapor: 

 Dr. Frank W. Very 175 



Quotations : — 



Medical Appointments at Vienna, 177 



Soientific Books: — 



Warren on the Mamynals of Colorado: Db. 

 J. A. AxLEi^. Buller's Researches on 

 Fungi: Pbofessoe G. H. Coons. Rich- 

 ards's Experimentelle Untersuchungen iiber 

 AtomgeiL-ichte : Peofessor Wilhelm Ost- 



WALD 178 



Scientific Journals and Articles 181 



A New Prin<nple in the Mechanism of Nuclear 

 Division: Professor Hugo de Vries 182 



Special Articles: — 



Unisexual Broods of Drosophila: L. S. 

 Quackenbush 183 



The Twenty-second Annual Meeting of the 

 Geological Society of America: Db. Edmund 

 Otis Ho^■ET 185 



MSS. intended for publication and books, etc.. Intended fot 

 review should be sent to the Editor of Science, Garrison-on- 

 Hodson. N. Y. 



THE FUTURE WHEAT SUPPLY OF THE 

 UNITED STATES^ 

 The subject of our future wheat supply- 

 is seen at once to involve four separate 

 questions, as foUows: (1) What is the pos- 

 sible increase in production that may be 

 attained? (2) How may it be attained? 

 (3) What is the probability of such attain- 

 ment? (4) Will this production satisfy 

 the demand? 



It is evident also that no tangible benefit 

 can come to the reader of any discussion of 

 this subject which does not have applica- 

 tion to some definite period of time. It is 

 assumed, therefore, in this present discus- 

 sion that we are concerned with movements 

 in the next forty years — or a period closing 

 with the year 1950. 



POSSIBLE INCREASE IN WHEAT PRODUCTION 



An increase in wheat production can 

 arise in two ways: (1) By an increase in 

 the wheat acreage, and (2) by an increase 

 in acre yields. 



INCREASING THE WHEAT ACREAGE. 



The wheat acreage may be increased 

 through an expansion in the farm area and 

 also by devoting a larger percentage of the 

 present farm area to wheat. 



Expansion of the Farm Area. — The total 

 land area of the United States is 1,900,- 

 947,200 acres. By the census of 1900 it 

 was shown that at that time 44.1 per cent, 

 of this area, or 838,591,774 acres, was in- 

 cluded in farms. The farms were of all 

 sizes, and of course were not entirely culti- 

 vated, many of them in fact, being large 

 ^Read before the Millers' National Federation 

 JIass Convention at Minneapolis, June 22, 1910. 



