IIEFEKENCE BOOKS 83 



Stevens, Introduction to Botany, pp. ;dl-44. D. ('. Heath and CoinpiuiN . 

 Tarr, .1 Handful of Soil. Cornell University Nature Study Quarterly, \o. 2, (Octo- 

 ber, 1899. 

 Tarr, A Summer Shower. Cornell University Bulletin No. 1, .lunc, 1S99. 

 Warren, Elements of Agriculture. The Macniillan ('onipany. 

 Wilkinson, Practical Agriculture. American Book Company. 



