660 
FREDERICK GUTHRIE ON THE THERMAL RESISTANCE OF LIQUIDS. 
Number of beat-units arrested 
in 1 minute by 1 square decimetre, 
1 millim. in thickness when 
T=20°*17 C. and AT=10° C. 
Acetate of amyl . . . . 
U r . 
. . 01060 
Amylamine 
. . 0-1075 
Amylic alcohol 
. . 0-1084 
Oil of turpentine . . . . 
. . 0-1245 
Nitrate of butyl . . . . 
. . 0-1258 
Chloroform 
. . 0-1283 
Bichloride of carbon . . . 
. . 0-1369 
Mercury amyl 
. . 0-1369 
Bromide of ethylen . . . 
. . 0-1395 
Iodide of amyl 
. . 0-1407 
Iodide of ethyl 
. . 0-1505 
In submitting these results to the Iloyal Society I am fully conscious of their incom- 
pleteness. I hope shortly to be able to extend my experiments, and to increase their 
accuracy. Meanwhile I would invite physicists to this interesting and important field 
of research, which promises an abundant yield to many independent cultivators. 
My thanks are due to the Managers and Professors of the London Institution for 
affording me an opportunity of carrying out my experiments. 
