CONTENTS. ix 



Bulletin No. 153 — Concluded. page 

 Record of the mean temperature from 1837 to 1888, inclusive, . 144 

 Record of the maximum temperature from 1838 to 1888, in- 

 clusive, 145 



Record of the minimum temperature from 1838 to 1888, in- 

 clusive, 146 



Bulletin No. 154. Alfalfa, 147 



Characteristics and value of alfalfa, 147 



Alfalfa compared \\dth clovers, 148 



Soil improvement, 149 



The soil for aKalfa, 150 



Lime necessary, 151 



Manures or fertilizers, 151 



Varieties, 152 



Obstacles to success, . . . _. 153 



Recent experimental work with alfalfa, 155 



Grimm compared with common alfalfa, 156 



Comparison of potash salts for alfalfa, 157 



Spring and summer seeding compared, 159 



Inoculation, 160 



Co-operative experiments with alfalfa, 163 



Selection of seed, 166 



Time and method of seeding, 166 



Harvesting alfalfa, 168 



Top-dressing, 169 



Summary, 169 



Bulletin No. 155. New fertilizer materials and by-products; and 



cocoanut meal, 173 



New fertilizer materials and by-products: — 



Introduction, 173 



Sheep manure and wool waste, 173 



Wool waste extracted of grease, 173, 174 



Fine-ground whale guano, 174 



Rockweed, 174 



Crude unground garbage tankage, 174, 175 



Calcined phosphate, 176 



Calcium cyanamid, 176 



Sewage tankage, 176, 178 



Picker dirt from cotton mill, 178, 179 



