REFERENCE BOOKS 433 



Kerner and Oliver: The Natural History of Plants, vol. 2. Henry 



Holt and Company. 

 Knuth : Pollination of Flowers. 3 volumes. Henry Frowde, Amen 



Corner, E. C., London, England. 

 Stevens : Introduction to Botany, chap. viii. D. C. Heath and Company. 



CHAPTER XVIII 



Beal : Seeds of Michigan Weeds. Bulletin 260, Michigan Agricultural 



Experiment Station. 

 Bergen and Davis : Principles of Botany, chaps, i, ii, xvi, xxxiii. Ginn 



and Company. 

 Coulter, Barnes, and Cowles : A Textbook of Botany, vol. 2, chap. v. 



American Book Company. 

 Curtis: Nature and Development of Plants, 3d edition, pp. 127136. 



Henry Holt and Company. 

 Kerner and Oliver: The Natural History of Plants, vol. 4. Henry 



Holt and Company. 

 Peirce : A Textbook of Plant Physiology, chap. vii. Henry Holt and 



Company. 

 Stevens : Introduction to Botany, chap. ix. D. C. Heath and Company. 



CHAPTER XIX 



To the following may be added an indefinite number of state and 



local lists and manuals, each of which will be useful to schools within 



the area that it covers. 



Apgar : Ornamental Shrubs of the United States. American Book Com- 

 pany. 



Apgar : Trees of the Northern United States. American Book Company. 



Armstrong and Thornber : Field Book of Western Wild Flowers. G. P. 

 Putnam's Sons. 



Blakeslee and Jarvis : Trees in Winter. The Macmillan Company. 



Britton : Manual of the Flora of the Northern States and Canada. Henry 

 Holt and Company. 



Britton : North American Trees. Henry Holt and Company. 



Britton and Brown: An Illustrated Flora of the Northern United States, 

 Canada, and the British Possessions. 3 volumes. Charles Scrib- 

 ner's Sons. 



Chapman : Flora of the Southern United States. American Book Com- 

 pany. 



Coulter and Nelson : New Manual of the Botany of the Central Rocky 

 Mountains. American Book Company. 



