Current Literature 227 



remove impurities before going to the still. The still is a large 

 copper kettle, 6^4 feet in diameter and 5 feet high. A charge 

 consists of 13^ tons of crude resin which fills the still to a depth 

 of a foot. Steam is passed through the charge by means of a 

 G-armed spray perforated with numerous holes, and in this way 

 the vapors of turpentine are removed and the rosin left behind. 



The steam and turpentine vapors are led oflf from the top 

 of the still by a 4-inch copper pipe into a cold water worm-tube 

 condenser. The distillate is separated mechanically, the turpen- 

 tine being led ofif by one pipe, the condensed water by another. 

 This turpentine from the separator is redistilled by steam, and 

 the oil passed through a series of tins containing lime water 

 which removes all possibilities of resinous impurities. This puri- 

 fied product is then thoroughly dried by being passed through a 

 tray of anhydrous sodium sulphate which is a strong dehydrating 

 agent. 



The rosin from the still is filtered through a fine wire screen 

 and cotton wool and run into wooden barrels. By far the largest 

 percentage of the output is equal to American W. G. and W. \V. 

 grades. This is said to be due to the superior method of tapping 

 employed, the care taken to exclude impurities and the prelimi- 

 nary purification of crude resin, and the low temperature of the 

 steam distillation. 



The average annual imports of India between 1907 and 1912 

 were 227,010 gallons of turpentine and 58,600 hundredweights of 

 rosin. It is anticipated that the Bhowali distillery alone will, in 

 three years, be in a position to supply about 60 per cent of the 

 total consumption of turpentine and well over 80 per cent of 

 the rosin consumption of India. 



S. J. R. 



Forest Products of Canada, 1Q13: Lumber, Lath, and Shingles. 

 By R. G. Lewis, assisted by W. E. Dexter and W. G. H. Boyce. 

 Bulletin 48, Forestry Branch. Ottawa, Canada. 1915. Pp. 55. 



This bulletin gives the statistics of the production of lumber, 

 lath and shingles by 2,187 mills operating in Canada in 1913. 



Lumber.— The total cut reported was 3,816,642,000 feet B.M., 

 a decrease of 13 per cent over that of 1912, which in turn 



