848 
ME. W. HOPKINS’S EXPEEDIENTAL EESEAECHES 
Another similar block gave almost identical results. 
XVII. (a.) Sandstone block, dry. 
l='17 feet. 
#2- 
211° 
173° 
c 
(h.) Same block, saturated with moisture. 
^2’ 
r. 
129° 
114°-4 
60° 
XVIII. {a.) New Eed Sandstone block, dry. 
Z='16 feet. 
12^°-5 
L. 
100°-8 
r. 
59° 
- = •25. 
c 
(b.) Same block, saturated. 
h- 
210°-4 
179°-5 
r, 
6l°-5 
c 
XIX. (a.) Millstone Grit, very hard and compact, diy . 
Z=-166 feet. 
h* ^2' I 
210^-25 182° 1 60° 
(b.) Same block, saturated with moistui’e. 
ty 
to. 
r. 
210°*5 
o' 
QO 
i 
59° 
-=•69. 
c 
