ADVICE TO EXPERIMENTERS. 89 



only because of the close botanical relationship of the swamp blue- 

 berry and the cranberry and the known similarity of their physiolog- 

 ical requirements in the matter of peat and moisture, as well as the 

 presence of a mycorrhizal fungus in the roots of both, but also and 

 especially because the most robust growth in all the pot experiments 

 occurred Avhen the roots of the plant were feeding on pure peat and 

 the pots were surrounded by moist sand. The important elfects of 

 these conditions are discussed on pages 08 to 71. Essentially the same 

 effects, it is believed, are secured by the system of culture used for the 

 cranberry. 



This publication closes with no special summary of results. The 

 mmibered statements which form its framework are in themselves a 

 sufficient summary for the general reader, and one who is led by these 

 experiments to undertake the culture of the blueberry will find it 

 profitable not to begin his work until he has read the whole of the 

 publication. These plants differ in their soil requirements so funda- 

 mentally from all our common cultivated crops that it is useless to 

 expect to succeed with their culture without a thorough understand- 

 ing of the principles governing their growth. 



Those desiring to look into the work of earlier experimenters can 

 find a key to the literature in F. W. Card's book entitled "• Bush 

 Fruits," or in the article by W. M. Munson on Vaccinium, in Bailey's 

 Cyclopedia of American Horticulture. 



