M. TECHNOLOGY. 557 



gradually 7500 grains of copal oil varnish, or any other oil 

 varnish. As considerable eifervescence takes place, a large 

 vessel is necessary. The desired consistency is given to it, 

 when cold, by addition of oil of turpentine. 15 C, 1872, 

 XVIII., 287. 



CEMENT OF CHALK AND SOLUBLE GLASS. 



If fine chalk be well stirred in soluble glass, a cement may 

 be produced which will harden in the course of six or eight 

 hours. The additions of powdered sulphuret of antimony 

 will give rise to a black mass, susceptible of a high polish, 

 and capable of receiving a fine lustre. Fine iron-dust gives 

 a gray-black mass of great hardness. Zinc castings can, it is 

 said, be readily repaired by a paste of soluble glass and zinc 

 dust. 1 i>,il[frcA, 1873, 156. 



FUCHSIN FOR PREVENTING PUTREFACTION. 



According to Lanjorrois, one of the best methods for pre- 

 venting the putrefaction or decomposition of animal substan- 

 ces, even when exposed to the air and to a high temperature, 

 consists in the addition of one-hundredth part either of fuch- 

 sin or of aniline violet. Among the numerous specimens 

 submitted by him to the Academy of Sciences was a solution 

 of gelatine which had been kept for eleven months, and was 

 still fresh. The author remarks that flesh preserved in this 

 manner has no waste, and when cooked is without odor, and 

 has the taste of fresh meat. Nevertheless, as aniline is be- 

 lieved to be quite poisonous in its character, it would be 

 hardly safe to use it for any thing intended to be subsequent- 

 ly eaten. And, again, the coloring effect of the material 

 would doubtless constitute an objection to its use in the arts; 

 and it is a question, after all, whether carbolic acid in an 

 equal amount will not have the same result in a still more 

 decided degree. 3 B, March 13, 1873, 445. 



ANTIPUTRESCENT QUALITIES OF SILICATE OF SODA. 



In a communication by Champouillon to the French Acad- 

 emy, upon the therapeutical and antiputrescent properties 

 of silicate of soda, it is stated that foetid pus, coming from an 

 ulcer of the thigh, and treated by silicate, became coagulated, 

 and lost its odor to a very great extent. A concentrated 



