Crehlenite. — Tiiamum. — Poisons. — Egypt. 463 



of barytes : it therefore contains an alkaline sulphate dissolved in 

 water, it leaves an insoluble residue not acted upon by the mine- 

 ral acids : this residue consists of different earthy bodies, mixed 

 v/itli a little oxide of copper. M. Robiquct suggests the adding 

 soda, in due proportion, and converting this acid into borax, as a 

 speculation likely to prove profitable. 



GEHLEKITE, NEEDLE-STONE, AND DATOLITE. 



Dr. E. D. Clarke has lately detected potass in this stone. The 

 property of forming a jelly in acids belongs to but few minerals, 

 and the Doctor had long suspected that it was owing to the pre- 

 sence either of an alkali or an alkaline earth in stones containing 

 silica. There seetns to be no exception but where zinc or lime 

 is present with the silica. In the instances of Needle-stone and 

 Daioiiie, which both yield a transparent jelly when acted on by 

 acids, and both contain lime, he has also detected Soda. 



TITANIUM FOUND IN OXIDULATED IRON ORE. 



M. Rohiquet has lately detected titanium in the oxidulated 

 octoedral iron from the steatite of Corsica. This ore, dissolved 

 completely in muriatic acid, then evaporated to dryness in a mo- 

 derate heat, and re-dissolved in water, leaves a white pulveru- 

 lent substance, which vyhen fiised with potash, and afterwards 

 dissolved in muriatic acid, gives all the characters of a solution 

 of titanium. In this manner, six parts have been separated from 

 100 of the mineral; and M. Robiquet is inclined to believe 

 that titanium generally accompanies the oxidulated iron in na- 

 ture, and that this compound is not, as has been thought, pe- 

 culiar to volcanic countries. — M. Berzelius found titanium in 

 Elba iron ore. 



POISONS. 



A correspondent suggests that a complete work on poisons, 

 especially those frequently met with, with their proper specifics 

 wheii such are known, is a desideratum in the healing art to 

 which medical authors should turn their attention. The experi- 

 ments of Dr. Orphila in Paris promise much valuable informa- 

 tion. It is now ascertained that sugar taken in lumps is a cer- 

 tain antidote for verdigris ; that vinegar counteracts the dangerous 

 effects of alkaline substances ; and that raw albumen (white of 

 eggs) if administered in time is a remedy for mercury sublimate. 



EGYPT. 

 [Continued from p. 396.] 



" Cairo, March 4, 1819- 

 " III our return to Thebes, we took in Ombos, Hagar, Tileit, 



and 



