744 EXPEEIMENT STATIC iT RECORD. 



applied in connection with a green crop planted preliminary to starting forest 

 seed beds. 



Some Doug-las fir plantations. — IV, Tortworth Wood, Gloucestershire 

 (Jour. Bd. Agr. [London^, 20 (1914), No. 10, pp. 865-875, figs. 2).— In continua- 

 tion of previous observations on Douglas fir plantations (E. S. R., 30, p. 446) a 

 record Including growth and yield tables is given for a small Douglas fir stand, 

 part of which was planted in 1872 and part in 18.83. 



Protomori^hic shoots in the g-enus Pinus, A. G. IIakpee (Quart Jour. For- 

 estry^ 8 (1914), No. 2, pp. 101-106, fig. 1). — The author here records some per- 

 sonal observations on the occurrence of protomorphic shoots in various species 

 of the genus Pinus and gives a brief bibliography of references to the subject. 



Ray tracheids in Sequoia sempervirens and their patholog-ical character, 

 W. S. Jones (Quart. Jour Forestry, 8 (1914), 'So. 2, pp. 81-94, pis. 3, figs. 6).— 

 The author here describes in detail ray tracheids which have been observed 

 a number of times in the wood of S. sempervirens. 



Cost accounts for reconnaissance surveys, A. B. Connell (Forestry Quart., 

 12 (1914), No. 1, pp. 44-46). — A system of cost accounting to be applied in 

 making reconnaissance surveys is here described in detail. 



Graded volume tables for Vermont hardwoods, I, W. Bailey and P. C. 

 Heald (Forestry Quart., 12 (1914), ^o. 1, pp. 5-23). — The authors here present 

 and discuss graded log scales and volume tables for beech, hard maple, and 

 yellow birch based on measurements of 1,200 trees in the woods and 3,500 logs 

 in the mill. They conclude from their investigation that local volume tables 

 can be prepared rapidly and economically if based upon mill tallies made from 

 all merchantable logs. 



Forest products of Canada, 1911. — Poles and cross-ties, K G. Lewis and 

 W. G. H. BoYCE (Dept. Int. Canada, Forestry Branch Bui. 35, rev. ed. (1914), 

 pp. 17). — ^A previous edition of this bulletin has been noted (E. S. R., 28, p. 

 645). 



[The wood industry] {Thirteenth Census V. S., 10 (1910), pp. 619-623).— 

 The statistics of 1909 are compared with those of previous years with reference 

 to the destructive distillation of wood industries and their products. 



Turpentine and rosin industry (Thirteenth Census U. 8., 10 (1910), pp. 

 679-694). — "This report covers the production of commercial spirits of tur- 

 pentine and rosin by the distillation of the resinous exudation of the pine tree, 

 the crude resin being derived from the lougleaf pine (Pinus palustris), which 

 is indigenous to a large coastal area stretching from North Carolina to eastern 

 Texas, and, to a less extent, from the Cuban or slash pine (P. heterophylla) , 

 and the loblolly pine (P. twda).'" 



The rubber and resin content of the desert rubber plant " giiayule " in 

 relation to rainfall, F. E. Lloyd (Jour. Soc. Chem. Indus., 33 (1914), No. S, 

 pp. 107-109). — In continuation of his previous investigations (E. S. R., 25, p. 

 844), relative to guayule (Parthenium argentatum), the author here discusses 

 the effect of varying rainfall on the rubber and resin content of the guayule 

 plant. 



From the data at hand the conclusion is reached that a relatively abundant 

 amount of rainfall results in a plant which simulates in many ways one grown 

 under irrigation, the likeness extending to the amount of rubber produced and 

 the relative volumes of bearing and nonbearing tissues. Plants grown under 

 these conditions yield a distinctly less amount of rubber than a typical desert 

 plant. Within the normal habitat of the guayule plant the amount of rubber 

 varies fully 62 per cent. The amount of resin secreted appears not to be 

 affected by the amount of soil water. Evidence is yet lacking that rubber and 

 resin secretion are casually related in the plant 



