REFERENCE BOOKS 83 



Stevens, Introduction to Botany, pp. 31-14. D. C. Heath and Company. 

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

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

 Warren, Elements of Agriculture. The Macmillan Company. 

 Wilkinson, Practical Agriculture. American Book Company. 



