10 INTRODUCTION. 



that time the cherries and plums are in good bear- 

 ing. So before you know that you have been wait- 

 ing, or have lost any time, the apples begin to 

 beckon you from their tossing boughs. 



It gives pleasure to acknowledge kindly assistance 

 rendered me in this work by Prof. Bessy, of 

 Nebraska; Prof. Budd, of Iowa, and J. Wragg, 

 E. R. Heisz,.C. G. Patton, H. A. Terry, also of Iowa; 

 Samuel Edwards, J. V. Cotta and D. Hill, of 

 Illinois; Peter M. Gideon and A. W. Latham, of 

 Minnesota. 



