giving lustreless surfaces of fracture; sp. gr. 0.41 to 0.90, the full
cubic foot weighing, accordingly, from 25 to 56 lbs.

D. _Pitchy peat_, (_Pechtorf_,) dense; when dry, hard; often resisting
the blows of a hammer, breaking with a smooth, sometimes lustrous
fracture, into sharp-angled pieces. Sp. gr. 0.62 to 1.03, the full cubic
foot weighing from 38 to 55 lbs.

In Kane and Sullivan's examination of 27 kinds of Irish peat, the
specific gravities ranged from 0.274 to 1.058.

3.--_Heating power of peat as compared with wood and anthracite._

Karmarsch found that in absolute heating effect

100 lbs. of turfy, air-dry peat, on the average = 95 lbs. of pine wood.
" fibrous " " " = 108 " "
" earthy " " " = 104 " "
" pitchy " " " = 111 " "

The comparison of heating power by bulk, instead of weight, is as
follows:--

100 cubic ft. of turfy peat, on the average[12] = 33 cubic ft. of pine
wood, in sticks.
" " fibrous " " = 90 cubic ft. of pine
wood, in sticks.
" " earthy " " = 145 cubic ft. of pine
wood, in sticks.
" " pitchy " " = 184 cubic ft. of pine
wood, in sticks.

According to Brix, the weight per English cord and relative heating
effect of several air-dry peats--the heating power of an equal bulk of
oak wood being taken at 100 as a standard--are as follows, _bulk for
bulk_:[13]

_Weight per _Heating
cord._ effect._
Oak wood 4150 lbs. 100
Peat from Linum, 1st quality, dense and pitchy 3400 " 70
" " 2d " fibrous 2900 " 55
" " 3d " turfy 2270 " 53
Peat from Buechsenfeld, 1st quality, pitchy,
very hard and heavy 3400 lbs. 74
Peat from Buechsenfeld, 2d quality 2730 " 64

These statements agree in showing, that, while weight for weight, t