M. TECHNOLOGY. 523 



rubbed on an ironing-board in one direction with a soft rag, 

 to distribute any lumps of starch. Collars, etc., should be 

 ironed dry, with a hot iron and considerable pressure. The 

 sticking of the iron may be prevented by drawing it, while 

 hot, over wax, and wiping it with a rag dipped in salt. 15 

 C\ XXIV., 1874, 380. 



PASTE FOE PHOTOGRAPHS. 



Paste prepared as follows is highly recommended by Tun- 

 ny for photographs: Mix thoroughly 630 grains of the finest 

 Bermuda arrowroot with 375 grains of cold water, in a cap- 

 sule, with a spoon or brush, then add 10^ ounces more wa- 

 ter and 60 grains of gelatin in fine threads. Boil, with 

 stirring, for live minutes, or until the liquid becomes clear, 

 and when cold stir in well 375 grains of alcohol and 5 to 6 

 drops of pure carbolic acid. Keep in well -closed vessels, 

 and before use work up a portion carefully with a brush in 

 a dish. It is said to keep for a considerable time. 15 C, 

 XXIIL, 1874, 357. 



MUCYLINE, A COMPOSITION FOR OILING WOOL. 



The so-called mucyline, for oiling wool, consists of sebacic 

 acid, 19.8 lbs.; potash soap, 19.8 lbs. ; glycerine, 11 lbs.; sul- 

 phate of zinc, 154 grains; and water,55 lbs. The sebacic acid 

 is carefully mixed with the glycerine, or instead of it with a 

 vegetable or animal mucilage, and the soap is then added. 

 The mixture is then diluted with 10- 1 quarts of water at 

 176, in which the sulphate of zinc has been dissolved, and 

 the rest of the water is then added very gradually, with 

 continual kneading of the mass. The very tough, homoge- 

 neous paste thus formed can be kept for two weeks, or even 

 longer, and the mucyline, which is a liquid of a density 1.025, 

 may be prepared from it, by adding to 35.2 lbs. of it 39.6 lbs. 

 of water, either cold or warmed to 68-77, according to the 

 season, and filtering the liquid or allowing it to settle. 32 

 C, April 1 0, 1 875, 1 74. 



WATER-PROOFING COMPOSITION FOR BOOTS. 



A mixture made as follows is said to render leather wa- 

 ter-proof and pliable, as well as far more durable, and at the 

 same time does not prevent its taking ordinary blacking : 



