ADDENDA. 
637 
It seems from the above, that M‘Laren has advocated views somewhat similar to some of 
those in this volume, on the influence of polar and equatorial currents in the distribution of 
the drift, and his conclusions must have been prior to mine. I may here be permitted to say, 
however, that my conclusions were arrived at entirely independently, and from a review of 
the various facts; finding that some general cause affecting the earth was necessary to a 
solution of the problem of the drift, and without any suspicion that any other individual had an 
idea of referring the phenomena of the drift to such a cause, with the exception of a sug¬ 
gestion by Mr. Redfield, which has been acknowledged. It is another of the many examples 
on record, that in the progress of knowledge, various persons entirely independently arrive at 
the same conclusions, or make the same discoveries. 
Discovery of a new Cave. 
A cave has been mentioned as having been discovered in Schoharie county in 1842 (Vide 
page 80). It is called “ Howe’s cave,” and “ Otsgarage cavern.” It is situated about four 
miles from Schoharie court-house, in Schoharie county. The proprietor has it now ready 
for the examination of all who wish to see this natural curiosity. It has been explored, it is 
supposed, to a distance of seven miles, and it seems to extend farther. Stalactites, stalag¬ 
mites, and “festoons” of stalactitic drapery occur in the greatest abundance. 
A view of the entrance to the cave may be seen on Plate 45. The cave is in the limestone 
of the Helderberg division. It is said to be the most extensive of any that has been explored 
in the United States, except the Mammoth cave in Kentucky. 
Section across the Clove corrected. 
The section across the Clove, fig. 5 of Plate 13, does not show exactly the position and 
order of the rocks (Vide note on page 363), as has been more recently ascertained. The 
sections figs. 182 of Plate 44 are believed to give the true position and order of super¬ 
position, where they are least deranged. 
Transverse Axis. 
The transverse axis that crosses Constitution island, and near the Cascade in the vicinity 
of West-Point (Vide p. 549, 622), is thought to be probably the same that crosses the north 
end of Skunnemunk mountain. 
Axis and valley of elevation, 6cc. 
An axis of elevation may be seen near West-Point, about half a mile west. The anticlinal 
line passes through the valley west of Fort Putnam, which is a valley of elevation. My 
Geol. 1st Dist. 83 
