POEESTRY. 449 



Administration report of the forest circles in the Bombay Presidency, 

 including Sind, for the year 1906-7 (Admin. Rpt. Forest Circles Bombay, 

 1906-7, pp. 197). — Data similar to tbe above ai'e presented relative to the admin- 

 istration of the State forests in the Northern, Central, and Southern circles 

 of the Bombay Presidency and Sind. 



Reports of the forest administration in Burma for the year 1906-7 {Rpts. 

 Forest Admin. Burma, 1906-7, pp. 177). — Data similar to the above are pre- 

 sented relative to forest operations in tbe Pegu, Tenasserim, Northern, and 

 Southern forest circles. 



The preservative treatment of loblolly pine cross-arms, W. F. Sherfesee 

 (U. S. Depf. Ayr., Forest Serv. Circ. 151, pp. 5-29, figs. 9). — A detailed account 

 is given of experiments conducted by tbe Forest Service in cooperation witli 

 the American Telephone and Telegraph Company and the Norfolk Creosoting 

 Company to demonstrate the inequality of the treatment received by different 

 classes of loblolly pine cross-arms and to furnish a basis for tbe development 

 of more uniform and economical treatments. 



The results of the entire study are summarized in substance as follows. 

 Cross-arms should be graded during manufacture into 3 classes : Class A con- 

 sisting of arms containing 75 per cent or more of heartwood, class B 75 per 

 cent or more of sapwood, and class C less than 75 per cent of eitber heartwood 

 or sapwood. The arms should be piled in the seasoning yard until they have 

 approached an air-dry condition, when they should be shipped direct to the 

 treating plant and unloaded on the cylinder buggies. Each class of arms 

 should be treated separately, the usual preliminary bath of live steam being 

 omitted and a vacuum applied only sufficient to draw the oil from tbe storage 

 tanks into tbe treating cylinder. If necessary, additional pressure should be 

 ajiplied to force tlie oil into tbe lieartwood jwrtions of the arms. The exact 

 amount of oil absorbed should be noted, and surplus oil blown back into the 

 storage tanks and a vacuum drawn and continued in the treating cylinder 

 until only the desired amount of oil is left in the timber. Heartwood arms 

 should finally contain about 6 lbs. of oil per cubic foot, sapwood arms about 

 10 lbs., and intermediate arms about 8 lbs. 



The total duration of the average treatment is estimated as considerably 

 mider 2 hours. 



Exports and imports of forest products: 1907, A. H. Pierson (U. S. Dcpt. 

 Agr., Forest Serv. Circ. 153, pp. 3-26). — Statistical summaries and detailed 

 data are given relative to the exports and imports of forest products including 

 both raw and manufactured material of various kinds for 1907. The data 

 are taken chiefly from the report of the Bureau of Statistics of the Department 

 f)f Comnierce and Labor upon The Foreign Commerce and Na\igation of the 

 United States for the year ending June 30, 1907. The summaries of the 

 exports and imports of forest products from and to tbe United States for the 

 years 1903 to 1007 inclusive show an increase in value of -1S.6 per cent for the 

 exports and 09.S per cent for the imports. In some cases the increase is due 

 to higher prices and in others to larger quantities. 



Turpentine and rosin (Bur. of the Census [U. S.], Manfrs., 1905, pt. 3, pp. 

 6.'i7-657). — A statistical discussion of the manufacturing of turpentine and 

 rosin as reported at tbe census of 1905, including comparisons with previous 

 censusses, and a discussion relative to the immediate future of the industry. 



Investigation of Manihot rubber, W. Schellmann (Pflanzcr, .) (190S), No. 

 .5. pp. 39-Ji5). — Analyses were made of the rubber taken from 48 trees of Mani- 

 hot gkiziovii, varying in age from less than 1 year up to 11 years, with the 

 view of determining whether increasing age has ii deteriorating effect on the 



