(?S 



EGYPTIAN HELIOTROPIUM. 



The refiduary fluid was further examined in the ufual man- 

 ner, but no other fubftance could be found, but what had been 

 introduced during the different proceffes made ufe of in this 

 examination. The analyfis of the mineral being therefore 

 compleated, from which it appears that 500 grains of the 

 Egyptian heliotropium contain. 



Component 

 parts of Egyp- 

 tian heliotropi- 



Silex - 



- 365 grains 



Alumine - 



- - 20^ 



Oxide of Iron 



- - 29| 



Lime 



. - 561 



Water 



- 24. 





495 





Lofs 5 





500 



Old Compton-Street, Soho, 





Sept. 8th, 1803. 





P. S. In my paper on the compound of phofphorus and ful- 

 phur in your laft Journal (Auguft) I obferve a typographical 

 error, p. 5. 1. 22. which materially affedsthe fenfe, and which 

 I will thank you to correft, namely, for -f, read -^ part. 



F.A. 



II. 



Method of clofing wide mouthed Vejfels intended to he kept from 

 communicating with the Air. In a Letter from Anthony 

 Carlisle, Efq. 



To Mr. NICHOLSON 

 Dear SrR, 



Clofure of wide iT is frequently defirable to clofe the openings of wide-mouth- 

 rontaining^ana-^^'^ veffels intended to contain fubftances which would be in- 

 tomical prepara-jured by free expofure to the atmofphere, or to evaporation, 

 tions. -pi^g prefent obfervations, however, originate in attempts made 



to improve the art of preferving anatomical preparations.— 

 The moft ufual liquids employed for what are termed " wet 

 preparations," are weak ardent fpirits, and diftilled oil of tur- 

 pentine. 



