282 INTRODUCTION TO PLANT GEOGRAPHY 



United States Department of Agriculture 1950-51 Yearbook. Crops in 

 Peace and War (U.S. Government Printing Office, Washington, 

 D.C., pp. [xviii -f ] 942, 1951). A veritable mine of information 

 inter alia on chemurgical uses and future possibilities. 



Poisonous plants are commonly treated on a local basis : 



L, H. Pammel. a Manual of Poisonous Plants : chiefly of eastern North 



America. . . (Torch Press, Cedar Rapids, Iowa, Pt. I, pp. viii + 150, 



and Pt. II, pp. i53-9"7, 191 1). 

 J. W. Harshberger. Textbook of Pastoral and Agricultural Botany 



(Blakiston, Philadelphia, pp. xiii + 294, 1920). Gives some idea of 



the magnitude of the subject on a wider basis. 



As well as the above more general works, there are various books which 

 are devoted to particular crops or closely-allied groups of crops. Along 

 these lines, apart from individual works, there are three special series in 

 English of which (i) the Economic Crops series of Interscience Publishers, 

 New York, has so far published books on Apples, Bananas, Cherries, 

 Cocoa, and Sweet Corn, while in (2) Longmans Green & Company's 

 Tropical Agriculture series there have appeared books on Cocoa, Rice, 

 Tea, and Bananas ; in preparation are Coconuts, Rubber, Oil Seeds, 

 Sorghum, Oil Palms, Cotton, and Spices. Also extensive and uniform 

 will be (3) the World Crops Books series of Leonard Hill Limited, 

 London, in which the volumes so far in press or arranged include separate 

 ones on Alfalfa, Barley, Brassicas, Coifee, Cucurbits, Eucalyptus, Flax 

 and Linseed, Hops, Jute, Mangoes, Mushrooms and Truffles, Oats, 

 Onions and their allies, Peanuts, Pineapple, Rubber, Rye, Sugar Cane, 

 Taros and their allies. Tomatoes, Tropical Cash Crops, Vegetable Fibres, 

 and Wheat. Each of these World Crops Books deals with the botany, 

 cultivation, and utilization throughout the world of the crop or group of 

 crops concerned, and each is profusely illustrated and fully documented. 

 An allied series, entitled Plant Science Monographs, also published by 

 Leonard Hill Limited, deals especially with research advances involving 

 inter alia many of these and other important crops. 



