VI CONTENTS. 



United States Department of Agriculture— Continued. Page. 



Farmers' Bulletin 72 147 



Farmers' Bulletin 73 197 



Farmers' Bulletin 74 181 



Farmers' Bulletin 75 154 



Division of Biological Survey : 



Circular 17 198 



Division of Botany: 



Circular 15 151 



Division of Entomology: 



Circular 27 (second series) 159 



Circular 28 (second series) 169 



Office of Experiment Stations: 



Bulletin 52 173 



Bulletin 53 171 



Section of Foreign Markets : 



Bulletin 13 197 



Division of Forestry: 



Circular 18 195 



Library: 



Bulletin, April, 1898 198 



Division of Publications: 



Bulletin 3 196 



Office of Road Inquiry : 



Bulletin 16 (revised) 196 



Division of Statistics: 



Bulletin 13 (miscellaneous series) 130 



Bulletin 14 (miscellaneous series) 197 



Crop circulars for May and June, 18 '8 197 



Weather Bureau : 



Monthly Weather Review, Vol. XXVI, Nos. 1-3, January-March, 1898.. 124 



Monthly Report of the River and Flood Service, January-March, 1898. 125 



Wrecks and Casualties on the Great Lakes, 1895-1897 125 



ILLUSTRATIONS. 



Page. 



Plate I. Action of different light rays on Colons leaves 112 



II. Action of different light rays on the coloration of plants 114 



Fig. 2. Sensitive plants grown in different colored light 105 



3. Sensitive plants grown at the same temperature in different colored 



light 106 



4. Lettuce plants grown in different colored light 108 



