68 ANNUAL RECOKD OF SCIENCE AND INDUSTKY. 



MAXCAN'ESE IX BLOOD AND MILK. 



According to Professor Pollatti, human blood contains man- 

 ganese as one of its essential elements ; and, concluding that 

 the same metal would be found in milk, he examined various 

 specimens of human milk, as also that of cows, goats, and oth- 

 er animals, and in every case he found unmistakable evidence 

 of the presence of this metal, the quantity in milk appearing 

 to be greater than that in an equal quantity of blood. 13-4, 

 June 11,237. 



AQUEOUS SOLVENT FOR SULPHUR. 



Various experiments have been made for the purpose of 

 finding an aqueous solvent for sulphur, this being considered 

 a very great desideratum in facilitating the use of this sub- 

 stance as a medicine. Dr. Pole announces that if flowers of 

 sulphur, previously well washed and dried at 2 12 Fahrenheit, 

 are mixed with an aqueous solution of pure anhydrous car- 

 bonate of soda, and the whole digested together at a temper- 

 ature of 212 for ten hours, an appreciable quantity of sulphur 

 will be taken up. Linseed oil is another solvent for sulphur, 

 the amount increasing with the increase of temperature. 

 1 A, October 28,214. 



SOLIDIFICATION OF MELTED ROSIN. 



Mr. Vincent, in remarking upon the readiness with which 

 broken ice resolidifies at temperatures above the freezing 

 point, calls attention to the same general principle seen in 

 other cases. Among these he cites rosin, which, when freed 

 from turpentine, and subjected to pressure in a melted condi- 

 tion, or otherwise, at ordinary temperatures, becomes com- 

 pletely pulverized, its particles showing no cohesive pow- 

 er whatever. If, however, the temperature of the rosin be 

 raised considerably above the melting point, on pressure be- 

 ing applied, a different result ensues, the mass becoming at 

 once solid at the core, the outside alone showing signs of 

 liquefaction. When rosin is melted for manufacturing pur- 

 poses, and the workmen neglect to stir it for even a few min- 

 utes, the whole mass becomes completely solidified, and lique- 

 faction takes place only at the exterior. From this and oth- 

 er instances stated by Mr. Vincent, he comes to the conclusion 



