290 
THE VOYAGE OF H.M.S. CHALLENGER. 
other forced iirp;umeiits, urges, as a direct proof of the correctness of the Darwinian theory 
of cond reefs, that the “ Tuscai’ora ” found hard coral rock in great depths at several places 
in the Pacific (for instance in 209G, 935, and 1390 fathoms). The “Tuscarora” samples 
have all passed through our hands. We have examined the samples referred to, and in all 
ciises they are Globigerina or Pteropod Oozes, and of course furnish no proof whatever of 
subsfdence. Dr W. B. Carpenter fell into the same error with respect to the “ Tuscarora ” 
soundings in a paper published in 1875,^ where he argues that all the submarine eleva- 
tions, on which “ white coral ” (Globigerina Ooze) was reported, must once have been 
coral reefs at the surface, hence furnishing a proof of Darwin’s views as to the formation 
of coral atolls through subsidence. In these cases the terms applied to the specimens of 
the deposits by the marine surveyors have led the writers to adopt an erroneous inter- 
}>retation. 
' Proc. Roy. Geogr. Soc., vol. xix. p. 511, 1875. 
