790 JOURNAI, OF FORESTRY 



Field experiments conducted during the years 1915 to 1919 were of 

 the same nature as those previously undertaken. As the system of re- 

 generation suggested was contrary to existing ideas, it was deemed ad- 

 visable to obtain further evidence. Studies were also made to deter- 

 mine the ideal seedling development for the locality and to elucidate 

 the injurious action of a dead layer of leaves on germination and early 

 growth. 



A general idea of the detailed and comprehensive nature of this study 

 is apparent in that the research was spread over a period of ten years 

 and the report covers sixty-five pages of rather closely written descrip- 

 tive matter and tables, accompanied by photographic reproductions. 

 The facts brought out from the large number of experiments made are 

 embraced in a summary of results under thirty- four headings, all 

 directly bearing on factors influencing the germination of early growth 

 of Sal in reference to the quick regeneration of Sal forests in northern 

 India. It appears from these researches that the earlier silvicultural 

 methods practiced in the regeneration of Sal forests will be materially 

 changed. 



There is great need in this country for ecological studies of the fac- 

 tors influencing the germination and early growth by many of our com- 

 mercial species in order to discover a method of practice that will re- 

 duce the time now required for regeneration and in order to make re- 

 generation more certain. The study of Sal conducted by the Forest 

 Research Institute of India points the way by which much profitable 

 agricultural research of an economic and practical nature might be 

 undertaken with a number of our own species. J. W. T. 



Precipitation and Growth of Oaks at Columbia, Missouri. By Wil- 

 Ham J. Robbins, University of Missouri, Agricultural Experiment Sta- 

 tion, Research Bulletin 44, August, 1921. 



Huntington, Douglas, Brewster, Shreve, Stewart and other writers 

 in this country and abroad have in recent years attempted to relate 

 growth in individual trees and in stands to weather conditions. The 

 author of the research bulletin under review has studied diameter 

 growth in sixteen oaks growing in the vicinity of Columbia, Missouri, 

 and has attempted to correlate growth with precipitation. For the 

 most part the species upon which the study was based were Qucrcus 

 rubra L. and Quercus inibricaria Michx., two of the most abundant 

 oaks of the region. The measurements were confined to the stumps 



