478 
MEASUREMENTS OF CRYSTALS. 
QUARTZ. (Continued.) 
Figs. 139 and 140. Twin crystals from 
Catskill, Greene county. The latter 
also occurs in Herkimer county. 
Fig. 148. A twin from Middleville, Her¬ 
kimer county. 
(The measurements will be found on 
page 476.) 
