Absence of Microscopic Calcareous Organic Remains in Marine Strata Charged with Siliceous Ones

Abstract

IN a letter headed “Deep-Sea Researches,” and subscribed “W. C. Williamson, Owens College,” in your issue of the 24th Dec. (vol. xi. p. 148), the author, after having stated that Dr. Wyville Thomson has come to the conclusion that the calcareous Globigerinæ and other such elements had been removed by the “solvent action of carbonic acid accumulated in the deep-sea waters,” adds that, “In my memoir [1847, op. cit.] I arrived at the same conclusion.”