258 SOILS AND FERTILIZERS 



72. Liebig : Die Chemie in ihrer Anwendung auf Agrikultur 

 und Physiologic 



73. Warington : Chemistry of the Farm. 



74. Lawes and Gilbert : Growth of Wheat. 



75. Lawes and Gilbert : Growth of Barley. 



76. Lugger : Minnesota Agricultural Experiment Station, Bulle- 

 tin No. 13. 



77. Lawes and Gilbert : Growth of Potatoes. 



78. Minnesota Agricultural Experiment Station, Bulletin No. 56. 



79. Shaw : L T . S. Department of Agriculture, Farmers' Bulletin 

 No. 11. 



80. White : LT. S. Department of Agriculture, Farmers' Bulletin 

 No. 48. 



81. Lawes and Gilbert : Permanent Meadows. 



82. Thompson : Graduating Essay, Minnesota School of Agricul- 

 ture. 



83. Nefedor : Abstract, Experiment Station Record, Vol. X, No. 4. 



