SCIENCE. 
255 
to be injured less, but are ready to crumble, and I think 
they are many times nearly as much impaired, and always 
somewhat injured, when water produces any injury. 
I would remark that my experiments with granites 
show that there is quite a range in their capabilities of 
standing heat, a range in fact much greater than I antici- 
pated. With the sandstones the difference is also marked, 
as is their power of absorption. When exposed to the 
heat wet, they show a marked difference in the time re- 
quired to heat them, the saturated ones seeming to resist 
the heat for a time ; but when equally hot they crumble 
the same as those not previously saturated. Their rela- 
tive worth can be seen by the table. The conglomerates 
stand heat badly ; while the limestones and marble stand 
best of all (up to the point where they, by continued heat, 
are changed to quick lime) except soapstone, and a 
species of artificial stone made under the McMurtire & 
Chamberlain patent. The indications are, from this and 
other samples of artificial stone, that it may be possible 
to make an artificial stone cheaper and better for fire 
proof buildings than our native quarries furnish; and we 
hope this possibility may receive attention. But corn- 
men's are useless, as the facts set forth in the tables 
speak for themselves. 
I give you results in tabulated form below. 
GRANITES. 
No. 
16 
17 
18 
KIND. 
Light colored. 
Denning’s Quarry 
Light colored 
Red 
Light colored 
Red 
Colored medium.. 
Sanborn’s Quarry 
Carter’s ^ Quarry 
Wetmore & Morse’s Quarxy 
Syenite 
Gray 1 
Common 
Scranton County Quarry... 
Old Dominion Quarry 
Light colored 
Coarse 
LOCALITY. 
Hallowed, Me 
Fox Island, Me. 
Mt. Desert, Me 
Rockford, Me 
Red Beach, Calais, Me 
Oak Hill, Me 
Stark, N. H 
Concord, N. H 
Plymouth, N. H 
Ryegate, Vt 
Woodbury, Vt 
Barre, Vt 
Quincy, Mass 
Croton, Conn 
Woodstock, Md._.. 
Port Deposit, Md 
Richmond, Va 
St. Cloud, Minn 
Stanstead, P. Q 
North Halifax, N. S 
Gauauogue, P. O., Can 
Q height Ratio of . First 
Specific of One Ah _ orD _ Appear- 
Gravity. Cubic • ^ ance of 
Foot. tl0n ' Injury. 
2.638 
2.642 
2.03T 
2.600 
2.636 
2.526 
2.631 
2.636 
2.649 
2.647 
2.654 
2-651 
2.660 
2.800 
2.648 
2.700 
2.727 
2.674 
2.690 
2 833 
2.698 
2.687 
Lbs. 
164.8 
165.1 
164.1 
162.5 
164.7 
157.8 
164.1 
164.7 
165.5 
165.4 
165.8 
165.6 
166.2 
175.0 
165.5 
168.7 
170.5 
167.7 
168.2 
177.0 
168.6 
167.9 
j +790 
1 +680 
1 + 716 
1 +482 
1 + 560 
1 + 310 
1 +534 
i + 778 
1 +685 
1 + 790 
1+784 
1 + 720 
1 + 650 
1 +818 
'+394 
t +816 
1 + 398 
I + 402 
I +280 
I +420 
I+584 
1 + 736 
Deg. Fah, 
800 
700 
800 
600 
800 
800 
600 
800 
800 
800 
800 
800 
750 
700 
700 
800 
75° 
750 
700 
800 
700 
800 
Crumbles 
or 
Cracks 
Slightly. 
Cracks 
Badly 
or 
Becomes 
Friable. 
Injured 
so as to be 
Worth- 
less for a 
Building. 
Melted 
or 
Ruined. 
Deg. Fah. 
Deg. Fah. 
Deg. Fah. 
Deg. Fah. 
900 
950 
IOOO 
I IOO 
800 
850 
900 
IOOO 
850 
950 
IOOO 
IIOO 
800 
850 
900 
95° 
850 
900 
950 
IOOO 
850 
QOO 
050 
IOOO 
700 
800 
850 
950 
900 
950 
1000 
1200 
900 
950 
IOOO 
1200 
900 
950 
IOOO 
1200 
900 
950 
IOOO 
1200 
900 
950 
IOOO 
1200 
800 
85O 
900 
IOOO 
750 
800 
900 
900 
75° 
800 
900 
900 
900 
950 
IOOO 
IIOO 
800 
850 
900 
IOOO 
800 
85O 
goo 
IOOO 
700 
800 
850 
900 
900 
IOOO 
IOOO 
1200 
800 
800 
900 
9OO 
850 
900 
950 
IOOO 
SANDSTONE. 
2 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12 
1 3 
14 
15 
16 
17 
18 
19 
20 
21 
22 
Freestone. 
Seneca Stone . 
Sandstone 
Montrose Stone 
Freestone 
S. Carboniferous 
Freestone.. 
Cincinnati Stone. .. 
Potsdam Sandstone - 
Berlin jStone 
Potsdam 
Euclid Stone 
Berea Stone 
Amherst Stone 
Brown Stone 
Potsdam Sandstone. 
Sandstone 
Freestone 
Brown Stone 
Portland, Conn. 
North of England 
Montgomery Co., Md 
Salem, Md 
Seneca, Md 
Ulster Co., N. Y. 
Belleville, N. J 
Nova Scotia 
Br. Phillipe, N. S 
Dorchester, N. B 
Cincinnati, O 
McBride’s Corners, O 
Cleveland, O 
McBride’s Corners, O.. 
Near Cleveland, O 
Berea, O 
Amherst, O 
Humbletown, Penn 
Beauharnois, P. Q 
Murray Bay, P. Q 
Cheat River, W. Va 
Acqua Creek, Va 
Manasses, Va 
2.380 
2. i63 
2.500 
2.452 
2.410 
2.661 
2 350 
2.424 
2-353 
2.363 
2.188 
2.333 
2.210 
2.500 
2.290 
2.254 
2.200 
2.346 
2.512 
2.577 
2.632 
2.183 
2.348 
148.7 
I + 
27 
135-5 
I + 
27 
156.2 
I + 
26 
153-2 
I + 
24 
150.6 
I + 
40 
166.3 
I +; 
3 T 4 
146.8 
1 + 
27 
151-5 
1 +240 
147.0 
1 + 
19 
747-7 
1 + 
26 
136.1 
1 + 
23 
145.8 
1 + 
28 
138.1 
1 + 
22 
156.2 
1 f 
22 
143. 1 
1 + 
35 
140.8 
1 + 
20 
737-5 
1 + 
18 
146.6 
1 + 
28 
157-0 
1 + 
3° 
x6(.o 
1 + 
36 
164.5 
1 + 
80 
• 36.4 
I + 
16 
I46.7 
1 + 
17 
850 
850 
850 
850 
900 
900 
900 
900 
900 
800 
900 
800 
850 
850 
850 
850 
850 
850 
850 
900 
800 
900 
850 
900 
900 
900 
900 
1 000 
1000 
950 
950 
950 
850 
950 
850 
900 
900 
900 
900 
900 
900 
900 
950 
850 
950 
900 
950 
95o 
900 
95o 
1100 
1 100 
1000 
1O00 
950 
900 
1000 
900 
1000 
95° 
950 
95O 
changes 
950 
953 
1000 
900 
1000 
1000 
1000 
950 
950 
1000 
1200 
1200 
1 100 
1100 
1000 
1000 
1 1 00 
1000 
! I IOO 
IOOO 
IOOO 
IOOO 
color. 
IOOO 
IOOO 
I IOO 
IOOO 
I IOO 
IIOO 
I IOO 
IOOO 
950 
IIOO 
1200 
1200 
IIOO 
IIOO 
IOOO 
IOOO 
IIOO 
I IOO 
IIOO 
IOOO 
1 030 
IOOO 
IOOO 
IOOO 
IOOO 
IIOO 
IIOO 
1200 
1200 
LIMESTONE. 
181.8 
2.478 
754.8 
I + 283 
85O 
900 
1 10 JO 
1 20 J 
1200 
Cincinnati Limestone 
... Hamilton County, O. 
— 2.204 
737.7 
1+28 
85O 
900 
950 
1200 
1200 
Potts Blue 
... Springfield, Penn 
2.606 
766.6 
I +280 
85O 
85O 
900 
IOOO 
1200 
Dolomite Limestone 
2.571 
160.6 
I +480 
85O 
goo 
I IOO 
1200 
1200 
Trenton Limestone 
. . . Montreal. P. Q 
— 2.706 
169.I 
I +3l6 
900 
950 
IOOO 
1200 
1200 
Limestone 
. . . Isle La Motte, Vt 
2.6^6 
l68.5 
I +320 
950 
IOOO 
1 10 J 
1200 
1200 
CONGLOMERATES. 
1 
2 
Conglomerate 
Potomac Stone 
Roxbury, Mass 
Point of Rocks, Md 
2.708 
2.724 
169.2 
170.2 
i+49 
1+60 
700 
600 
800 
700 
900 
800 
IOOO 
900 
IOOO 
900 
3 
Conglomerate 
Cape a La Aisle, P. Q 
2.645 | 
>65.3 
1+80 
600 
700 
800 
900 
900 
