884 TRAySACTIONS of the AMERICA^^ LrSTITUTE. 



acid gas tlirougli the water until tlie bones become completely soft- 

 ened. Tliej are afterward washed in water wherein some of the gas 

 has been previously dissolved. It is well known that hydrochloric 

 acid is used for the same purpose, but it is objectionable on account 

 of the formation of chloride of calcium, which intereferes with the 

 drying of the gelatine. 



Fluosilicic Acid for Refixixg Sugar. 

 M. Marix has obtained a patent in France for the employment of 

 fluosilicic acid in purifying beet-root and other saccharine juices. 

 The juices are diluted with water, to remove viscidity, and sufficient 

 fluosilicic acid is then added to precipitate all the salts of potassium ; 

 powdered chalk is then used to saturate any excess of the acid. A 

 clear liquid is next obtained by filtering, which is treated afterward 

 in the usual manner. 



Effect or Heat on Galvanic Batteries. 

 M. Crova, in the Paris Cosmos, gives the result of his researches 

 as follows : 1. The electromotive force of a Daniell element decreases 

 regularly with the increase of temperature ; (this conclusion is directly 

 at variance with that of the best American electricians.) 2. The force 

 pf a Grove element increases with temperature. '3. The force of an 

 plement containing only one liquid, as in Smee's battery, is inde- 

 pendent of the variations of temperature. 



Antimony for Galvanic Batteries. 

 M. Bottger, is reported in a Paris journal as reconmiending for 

 force and durability, the following arrangement: A cylinder of 

 amalgamated zinc is placed in a concentrated solution of equal parts 

 of common salt and sulphate of magnesia ; the antimony is placed in 

 a porous cell filled with dilute sulphuric acid. 



Hungarian "Wheat. 

 It is Well known that the composition of wheat varies slightly, 

 according to climate and soil. Samples of Hungarian wheat from 

 the extensive granaries of Pesth, have been analyzed, and O. Demp- 

 wolf reports the result for 100 parts: Water, 10.511; ash, 1.505; 

 gluten, 14.352; starch, 65.-107; fatty matter and woody fiber, 8.225. 

 Tlie existence of sugar could not be proved. The chief ingredients 

 <jf the ash were found to be — phosphoric acid, -19.902; potash, 

 81.825 • magnesia, 14.862 per cent. 



