66 
Proceedings of the Royal Society 
glass vessel, 4 inches diameter at the top and 3 inches at the 
bottom, and being open at the two ends; its narrow end was 
closed by a tightly-stretched membrane, thus securing good 
contact. 
In this way a large number of bodies was examined, with follow- 
ing results : — 
Ice, along ax. . = 
134 
Kamptulikon . 
•00660 
Ice, perp. to ax. = 
128 
Vulcanised India-rubber 
•00534 
Black marble . 
106 
Horn 
•00522 
White marble . 
0691 
Beeswax . 
•00522 
Slate 
0486 
Felt 
•00522 
Snow 
0432 
Vulcanite 
•00500 
Cork 
0430 
Haircloth 
*00241 
Glass . 
0300 
Cotton wool (divided) 
•00260 
Pasteboard 
0272 
„ (pressed) 
•00201 
Carbon 
0243 
Flannel . 
•00213 
Roofing felt 
0201 
Coarse linen 
•00179 
Firwood (parallel to fibre) 
0180 
Quartz, along axis . 
•0553 
„ (across fibre and 
99 
•0745 
along the radius) 
00529 
99 99 
•0340 
Boiler cement . 
! ) „ n flC 
00975 
99 99 
•0498 
raramn 
00843 
Sand (very fine) 
00788 
„ Perpendicular 
•240 
Sawdust . 
00736 
•265 
With regard to some of these substances, I may say that the 
white marble comes from Italy, though I know nothing more 
about it. 
The slate is that commonly used for roofing. 
The snow was frozen, and in consequence did not compress very 
evenly. 
The cork was cut so that the conduction was along the fibre. 
The pasteboard was the thick brown material often called mill- 
board. 
The carbon was kindly lent me by Professor Tait. 
The roofing felt was that commonly known as asphaite roofing 
felt. 
The firwood was thoroughly seasoned. 
The boiler cement is that supplied by Messrs Fleming, 23 St 
Vincent Place, Glasgow, and was kindly given to me along with 
several other materials. 
