HARD AND WHitE COPPER. £§7 



and tranfported without fpoiling, is not to keep acock with (he 

 hens in the poultry yard. It is an error to fuppofe that eggs 

 not fecundated have a worfe tafte than thofe which are fo. 

 The author afcertained that the moft delicate palate was inca- 

 pable of difcovering any difference. Afterwards it is only re- 

 quifiteto (belter the egg9»from humidity, light, heat, and frod. 

 The method which fucceeded bed with the author was to pro- 

 cure balkets made of llraw, in which he placed the eggs with 

 layers of chaff between them. The ftraw and the chaff are 

 dry materials, fmooth, very bild conductors of heat, and con- 

 fequently, very proper to preferve the chara6ler of freflinefs in 

 the eggs: thcfe balkets were afterwards fufpended in a dry, 

 dark and airy (ituation. 



XII. 



Method of giving the Colour , Grain, and Hardnefi of Steel to 

 Copper. By B. G. Sage*. 



.ARGRAFF and Pellctier have publifhed their invefliga- 

 tions relative to the union of phofphorus with different metallic 

 fubflances; the French chemifl has brought this procefs to per- 

 fedion : it was by repeating and varying his experiments that 

 I difcovered that the readied and moft certain method of phof- The readleftand 

 phorating copper is to take the copper in the metallic form, toJJ^^j 0^011^1112' 

 melt it with two parts of animal glafs, and a twelfth part of copper andphaf- 

 powdered charcoal. But it is effential that the copper fliould^^°'^^^* 

 offer a large furface; an advantage which is obtained by uiing 

 chips of this metal, which are to be placed in alternate layers 

 with the animal glafs mixed with the powdered charcoal, I 

 expofe the crucible to a fire brilk enough to melt the animal 

 glafs; it forms phofphorus; the greatefl part of which burns, 

 while another part combines with the copper, in which it is 

 fo confolidated that it does not quit it, although it is kept ia 

 fufion for twenty minutes under the animal glafs which has not 

 been decompofed. 



When the crucible has cooled and is broken, the phofpho- Phofphorated 

 rated copper is found under the glafs, which has paffed to the ^^P^'^'^' 



* From Journal de Phyfique, Meffidor, An. XII. 



4 fiale 



