PERIODICAI, LITERATURE 847 



SILVICULTURE, PROTECTION, AND EXTENSION 



Comparisons of the growth of Japanese and 



Larch at European larch at Brocklesby Park, England, 



Brockleshy Park which was set out in lUOo-O-i, spaced 4 by 4 feet 



and mixed with hardwoods in the proportion of 



two softwoods to one hardwood. Measurements, presumably in the 



winter of 1919-20, show the following average girths of trees on an 



area which has been thinned three times : Japanese larch, 14 inches ; 



sycamore, 11.2 inches ; ash, 9.7 inches ; elm, etc., 9.4 inches. On another 



area, twice thinned, European larch has an average girth of 13.1 



inches; sycamore, 11 inches; ash, 9.6 inches; beech, 5.4 inches; and 



other hardwoods, 8.1 inches. C. R. T. 



Havelock, W. B. Common and Japanese larch at Brocklesby Park. Quart. 

 Jour. Forest., 14:59-61. 1920. 



This is a short discussion dealing with the 



The Beech in lack of beech reproduction on the chalk Wolds of 



Lincolnshire Lincolnshire, where there are many good beech 



woods but no natural beech regeneration. The 



author raises the question as to reasons for this, but does not answer it. 



C. R. T. 



Greenfield, W. P. The beech in Lincolnshire. Quart. Jour. Forest., 13 :269- 

 271. 1919. 



MENSURATION, FINANCE, AND MANAGEMENT 



Yearly diameter measurements of sample areas 

 The in several tracts of beech woodland situated in 



Maplcdurham South Oxfordshire, England, and actual volume 

 Statistics measurements of trees felled in these woods, dis- 



close some interesting variations in volume related 

 to the density of the crop. In dense woods, due to increased height 

 growth, the average cubic contents of trees of equal diameters is 

 higher than in woods where the trees are widely spaced. The mean 

 annual increment for a 7-year period for seven pieces of woodland 

 varied from L81 per cent to 5.4 per cent and averaged 2.8 per cent. 

 The increment of LSI per cent is for a woodland where the trees 

 stood too close and that of 5.4 per cent is for one where they did not 



