846 
ME. W. HOPKUs^S’S EXPEBEyiEXTAL EESEAECHES 
(d.) Blocks interchanged. 
I. 
II. 
1 
r. 
210°'9 
175°’5 
175° 
176° ' 176°-8 
65^ 
k 
k 
:-52 
"=•53 
C 
c 
The means of (a.) and (d.) give for I., ^ = -515 ; and for II., ^ = -52. 
X. One block was broken transversely, and the two parts again fitted accurately 
together without any interposing substance. 
Broken Block. 
Whole Block. 
h' 
210°-9 
I6l°.3 
o • 
176° 
^2* 
175°-5 
r. 
65° 
XI. The two parts of the broken block cemented together by plaster of Paris applied 
wet and allowed to dry and harden. The length of the block was thus increased one- 
twentieth of an inch. 
Broken Block. 
Whole Block. 
h' 
h' 
^2* 
t,. 
t'. 
o* 
T. 
210°*2 
170° 
l72°-6 
17"4° 
17’2° 
57° 
XII. Finely powdered dry clay placed between the two parts of the broken block. 
The length was increased by one-tenth of an inch. 
Broken Block. 
Whole Block. 
ty 
<2* 
t'-r 
r. 
210°-2 
l65°-6 
173° 
174° 
173°-2 
59° 
XIII. Without removing the blocks the temperature was reduced. 
Broken Block. 
Whole Block. 
ty 
#0. 
^2- 
t,. 
T. 
154°-6 
126°-3 
131°-3 
131° 
129°-2 
56° 
XIV. (a.) The two portions of the broken block cemented by moist clay, and pressed 
