KERRY WOODS. 



carries 1,760 cub. ft. of maritime' pine (130 trees) per acre at an 

 age of 75 years : 



This soil consists of over 90 per cent, pure sand with extremely 

 small quantities of lime, potash and phosphoric acid. 



Ramann f states that the greatest use of chemical analyses in 

 connection with forestry is for peaty soils. The quantities of 

 mineral salts are in such cases a very good guide to the productive- 

 ness of the soil. With very sandy soils, according to Schiitze, 

 the chief factor governing the yield is the soil content in mineral 

 food.* Ramann summarises Schiitze 's results in the following 

 table. The quality classes refer to Scotch pine, I. being the best 

 and V. the worst. 



From this table it appears that the soils richest in lime and 

 phosphoric acid yield the greatest volume of .timber, but that 

 variations in the quantities of potash and humus are of little 

 moment. 



With heavier soils, however, the results of chemical analyses 

 are of less use. The effect of varying quantities of mineral salts 

 is masked by other factors such as mechanical composition and 

 general condition. 



The analyses of the soils from Kerry show that they are 



t Bodenkunde, 1905, p. 203. 



* The present state of knowledge on the subject is, however, unsatisfactory, recent 

 experiments tending to disprove Schiitze's conclusions (see Int. Mitt, fitr Bodenkunde, 

 Band I, 1912, Heft. 6). 



