. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. Fig. 4. RELATIONS OF A TETRAHEDRAL LITHOSPHERE TO ITS HYDROSPHERE. FIG. 4a REPRESENTS THE ARRANGEMENT IN A SIMPLE TETRAHE- DRON. FIG. 4b ILLUSTRATES THE CASE OF A MODIFIED TETRAHEDRON (SUCH AS SHOWN IN FIG. 5b), BY A SECTION PASSING ON THE LEFT THROUGH A TETRAHEDRAL COIGN, AND ON THE RIGHT THROUGH THE OP- POSITE TETRAHEDRAL FACE. THE SHADED AREAS REPRESENT WATER. THE TETRAHEDRAL THEORY. Elie de Beaumont's scheme is now mainly of historic in
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. Fig. 4. RELATIONS OF A TETRAHEDRAL LITHOSPHERE TO ITS HYDROSPHERE. FIG. 4a REPRESENTS THE ARRANGEMENT IN A SIMPLE TETRAHE- DRON. FIG. 4b ILLUSTRATES THE CASE OF A MODIFIED TETRAHEDRON (SUCH AS SHOWN IN FIG. 5b), BY A SECTION PASSING ON THE LEFT THROUGH A TETRAHEDRAL COIGN, AND ON THE RIGHT THROUGH THE OP- POSITE TETRAHEDRAL FACE. THE SHADED AREAS REPRESENT WATER. THE TETRAHEDRAL THEORY. Elie de Beaumont's scheme is now mainly of historic interest, though Lef- ort's recent map of the Nivernais shows that it is still used as a workin g hypoth- esis by some French geologists. But Elie de Beaumont's theory marked an epoch in this subject, for it led to the system of Mr. Lowthian Green, which far better meets the requirements of the case. This system was founded in 1875, by Mr. Lowthian Green, in a work which was neglected or ridiculed at the time of its appearance. Like 'This objection applies also to various later modifications of Elie de Beaumont's principle, such as those of Owen, or to the more than local acceptance of the diaclases of Daubrt'e or orthogonal cross folds of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
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