$1 Account of a new Wood for Dyeing. 



No. XIV. Paper dipped in the acetite of magnefia. — Paper 

 clipped in this fait did not appear to be in the leaft changed. 

 It burnt with a weak white flame like common paper, and 

 was converted into a very friable afh-coloured coal. 



No. XV. Paper dipped in acetite ofbarytes. — Paper dipped 

 in this fait feemed, like the former, to have undergone no 

 vifible change. It burnt with a white flame, as common 

 paper, and was at laft changed into a coal of the like kind. 



From the above obfervations it appears, that white falts 



do not deprive paper of its combuftiblenefs like the liquor of 



flint. Some of them alfo, inftead of defending it from the 



action of the fire, tend rather to accelerate its destruction, 



as, for example, the fulphites. The fulphureous acid which 



they contain lofes with the inflammable body its oxygen, is 



converted into fulphur, and produces a little liver of fulphur, 



which is deftroyed at the fame time with the paper by the 



flames. 



[To be concluded in the next Number.'] 



XXII. Report made to the Council of the Mines in Spain rc- 

 fpecling a new Wood proper for Dyeing, called Paraguatan. 

 By D. Dominic Garcia Fernandez, Infpeclor of the 

 Mint. From the Annales de Chimie. 



I 



N compliance with the orders of the Supreme Council of 

 Commerce and the Mines, I undertook a chemical examinar- 

 tion of a wood known in Guiana under the name of Para- 

 guatan. This examination I carried to fuch a length as I 

 thought neceffary for acquiring a knowledge of its nature, 

 and of the advantages that may be derived from it in dyeing. 

 I obferved in the firft place that the bark, the wood properly 

 fo called, and the leaves of the paraguatan produce different 

 colours. The leaves, however, do not merit much attention, 

 as they communicate only a fading and not very agreeable 

 colour. My researches have, therefore, been directed chiefly 

 to the bark, as that part is the moll important, and my obser- 

 vations 



