394 Intelligence and Miscellanies. 



a test solution of indigo, and secondly, upon a test of dilu- 

 ted molasses. 



Blood calcined with potash, 



Blood calcined with chalk, 



Blood calcined with phosphate of lime, 



Gelatine calcined with potash, 



Albumen calcined with potash, 



Fecula calcined with potash, 



Charcoal of acetate of potash. 



Charcoal obtained by the decomposition of 



sub-carbonate of soda by phosphorus. 

 Lampblack calcined, .... 



do. calcined with potash, 



Charcoal of bones treated with muratic 



acid and potash. 

 Charcoal of bones treated with muriatic acid, 

 Vegetable or animal oil calcined with phos- 



pliate of lime, 

 Charcoal of bones — crude, 



50. Manufactory of diamonds. — Several accounts of the 

 crystallization of pure carbon by artificial means and the 

 consequent formation of diamonds possessing the hardness, 

 transparency and refractive power of that most valuable of 

 all the gems, have been published in the journals, and have 

 attracted public attention. But on the 24th of Nov. last 

 M. Thenard stated to the academy of sciences, that in con- 

 junction with Dumas and Cagniard de la Tour, he had care- 

 fully analysed these crystals, and had ascertained that they 

 were only silicates and not artificial diamond. — Ann. de 

 Chim. Nov. 1828. 



51. Leeches. — In a journal entitled the Westphalian Indi- 

 cator, a physician states a case in which leeches that had 

 been employed on a person affected with syphilis, were af- 

 terwards used on a child and communicated to the infant 

 the same disease. Hence, when leeches are used a second 

 time, care should be taken with respect to the nature of the 

 disease of the person on whom they are at first employed.* — 

 Fer. Bid. Jan. 1828. 



* Dr. Salle of Fontainbleii, proposes as a means of economising leeches, to 

 cut them in two while in the act of suction. The animal, notwithstanding this 

 operation continues to draw blood, and it can be made to fall at pleasure by put- 

 ting on the adhering part some salt or tobacco. 



