M. TECHNOLOGY. 521 



yield to an extent of over thirteen per cent., while the qual- 

 ity of the article produced is decidedly better. 



M.Jules Robert, the inventor of the process, claims that it 

 is now in use in over three hundred factories in Germany, 

 Poland, Russia, and Holland. A complete apparatus for 

 working up 100 tons of cane per day consists of one ten-horse- 

 power engine and boiler, five cane-cutting machines of one 

 horse-power each, 20 vessels, each of 170 cubic feet capacity, 

 and one overhead reservoir holding 2000 gallons. About 

 7000 to 8000 gallons of water will be required (exclusive of 

 that needed for the boilers) to form the diffusion juice, this 

 being produced by the addition of one ton of water to the 

 ton of cane slices. 



PAPER INDUSTRY OF THE UNITED STATES. 



From the Paper Trade Journal it appears that during 

 1872 there were in operation in the United States 812 pa- 

 per-mills, owned by 705 firms, and representing a value of 

 $35,000,000. In addition to this actual value of mill proper- 

 ty, there is the usual working capital 22^ per cent, of the 

 value of the mills making the total capital invested in pa- 

 per-making throughout the country about $43,500,000. The 

 mills employ 13,420 male and 7700 female hands, besides 922 

 children or a total of 22,042 laborers, whose wages amount 

 to $10,000,000. The production of these mills during the 

 year was 317,387 tons, valued at $66,475,825. 



UTILIZATION OF CERTAIN OFFAL. 



Professor A. H. Church, in a paper published in the "Trans- 

 actions of the Highland Agricultural Society," refers to cer- 

 tain waste refuse matter, for the purpose of showing the eco- 

 nomical products that maybe obtained from them. According 

 to this, fresh blood contains 3 per cent, of potential ammonia, 

 5 per cent, of potash, and 1 per cent, of phosphoric acid. Dry 

 blood is five times as rich. Blood may be utilized as manure 

 by mixing with dry peat, or by coagulation with 3 per cent, 

 of quicklime, and then drying. Flesh, fish, hair, and wool 

 are best prepared for manure by heating with steam under 

 pressure. Horn, when gently roasted, may be powdered. 

 Glue refuse is a slimy matter, containing in the fresh state 

 ] .75 per cent, of nitrogen, and when dry 3.8 per cent. " Trot- 



