PHYSICAL anv LITERARY. 257 
Prats differ confiderably, according to 
the pains beftowed in making them. Such 
as are perfectly freed from all hétrogene- 
ous matter, well knead and wrought, are 
the beft of all. Upon which account, 
peats, made in the province of Holland, 
where no labour is {pared in the working 
them, are preferable to all others; tho’, 
in other places, the fubftance may be e- 
qually good. A Dutch peat fix inches 
long and three or four thick, will weigh 
a pound; a peat made at Nimiguen, of 
the fame dimenfions, will not weigh above 
half a pound, often lefs. It is a general 
obfervation, that all peats made of mofs- 
mud, and well knead, are confiderably 
heavier than fuch as are only cut out of 
the mofs. 
- Prats that are of a dark colour, and 
folid, that continue longeft in the fire 
without confuming, that have a good cin- . 
- der, and fall into white afhes, are moft 
_efteemed: On the contrary, fuch as are 
light and porous, confume quickly in the 
' fire, leave no cinder, but a great many 
impurities and afhes, are little valued. 
Vou. II, Kk THE 
