REFERENCE BOOKS 83 



Stevens, Introduction to Botany, pp. 31-44. D. C. Heath and Company. 

 Tarr, A Handful of Soil. Cornell University Nature Study Quarterly, No. 2, Octo- 

 ber, 1899. 

 Tarr, A Summer Shower. Cornell University Bulletin No. 1, June, 1899. 

 Warren, Elements of Agriculture. The Macmillan Company. 

 Wilkinson, Practical Agriculture. American Book Company. 



