1893. | NEW YORK ACADEMY OF SCIENCES. 89 
arch, and where mined out beyond the trap dike this arching 
crest is very strongly suggested. 
3. In the earlier mining (1885), when the roof was accessible 
to Bemis and Woolson, they noted radiating and tapering vein- 
lets of willemite which penetrated it. 
4. Ifa collapsed anticline be not supposed, we have a bed-like 
body of ore, terminating in a rounded and swollen mass, more 
than three times the average thickness elsewhere, and extending 
in a practically straight line on the pitch over 2,000 feet. Ac- 
cording to this supposition we would naturally expect the ore 
Fic, 8. STEREOGRAM OF THE FRANKLIN FURNACE ORE-Bopy. 
to gradually pinch out, or to end in ramifications, or in a leaner 
and leaner wall rock. 
Granting the collapsed anticline the lengths of the flanks can 
be plotted to scale from the known pitch, the outcrop and 
the inclined section of it on the surface. This has been done in 
the sections. The original bed of ore only sufficed to form the 
anticline, else a further outcrop would be found, tailing out 
southeast of the point where the trough of the syncline inter- 
sects the surface. The accompanying figure (Fig. 8.) gives an 
idea of the shape of the ore, stripped of its walls. On the sec- 
tions, AA., BB. and CC., it can also be traced. They in- 
