Method of giving to Cotton and Linen Thread , 8gc, 253 
other places, which were uncovered, have been inflamed 
by the combined action of the heat and rain. 
10. The Phosphorus contained sometimes in Charcoal . 
It may happen also that the small quantity of phospho- 
rus, which is sometimes formed in the carbonization of 
different kinds of wood, without uniting to lime or to pot- 
ash, remains combined with the charcoal, which in this 
case does not disengage phosphorated hydrogen gas, and 
does not easily inflame by the mere action of water or 
moist air, but which may produce a violent detonation 
when struck with saltpetre (nitrate of potash.) It is very 
probable that the three successive explosions which took 
place in the powder-mill of Yonges were in part owing 
to a similar cause. 
Charcoal in general has a great influence on the differ- 
ent products of nature and the arts. It is often observed 
in forges and founderies, especially those of iron, that 
the products vary according to the nature of the char- 
coal employed. The bad quality found sometimes in iron 
of being cold short is generally ascribed to phosphoric 
acid contained in the ore ; but as the ore by the same 
processes furnishes in the same foundery one kind of iron 
better than another, the difference appears often to arise 
in part from the charcoal. 
No. 34. 
Addition to a Memoir on the Method of giving to Cotton 
and Linen thread the Adrianople Med , and other fixed 
Colours , and on Spontaneous Inflammations. By J. M, 
Haussman 
To give to cotton and linen thread all kinds of dura- 
ble colours, nothing is necessary but to flx on these 
* Tilled^ v. Ig p. 340. From the Jlnnaks de 0iimie t No. 144. 
