PERIODICAL LITERATURE i 0\) 



From the fact that shade-demanders only require protection from 

 the sun during their early years, and also from the fact that the actinic 

 power of light is almost as great in good diffused light as in direct sun- 

 light, it seems probable that it is protection from the heat effects of 

 the sun rather than from the actinic power of the light which shade- 

 demanders require for their natural regeneration. 



In order to obtain a correct idea of the light requirements of differ- 

 ent species growing on the hills, for comparison with each other and 

 with species growing on the plains, the influence of aspect must be 

 eliminated by considering under what conditions natural regeneration 

 would take place if the species were growing on a level plain at the 

 elevation of their optimum growth, which in the case of Deodar, would 

 be at about 7,000 feet. 



As regards soil, the author points out that the humous content is the 

 important modifying factor, especially as to drainage, aeration, and 

 nitrogen supplies, and recognizes non-humous soil deficient in nitrogen ; 

 moderately or well-aerated humous soil, and excessively humous or 

 badly aerated humous soil. The first is found where the soil is exposed 

 to the glare of the sun ; the second under moderate shade ; the last 

 under heavy shade. 



This correlation of soil and light conditions suggests a correlation 

 between light and soil requirements of a species for its natural regen- 

 eration. Consequently species adapted to regenerate on a non-humous 

 soil are also adapted to regenerate with full exposure to the sun. 

 Hence, if the light conditions required by a species for its natural re- 

 generation is known, the soil conditions which it requires can be more 

 or less deduced therefrom and vice versa. Examples are given- to show 

 that this correlation is borne out by observation, and Indian species are 

 classified accordingly and a few practical examples of procedure given. 



Correlation Between the Light and Soil Requirements of a Species for its 

 Natural Regeneration. Indian Forester, April, 1917, pp. 186-194. 



MENSURATION, FINANCE, AND MANAGEMENT 



In India two methods are used in classifying 

 Standardization tree measurements, namely, by girth and by diam- 

 of eter. Girth measurements are made by 18-inch 



Tree periods (classes), trees over 6-feet girth being 



Measurements called first class. Diameter measurements are 

 made in 6-inch classes, trees over 2 feet in diam- 

 eter being classed as I, although it is about two-sevenths of a foot 

 greater in girth. Reform in this matter has been discussed in former 



