B. K. EMERSON — TETRAHEDRAL EARTH: INTERCONTINENTAL SEAS 



and the equator in 90 degrees east and west longitude, and asks would not 

 this bring the axis of figure and rotation 20 degrees south between Green- 

 land and Spitzbergen? The paper was discussed by J. F. Twisden* 

 and several others, and no one seems to have noticed that this would 

 carry the axis of figure 20 degrees in the other direction, namely, to near 

 Bering strait. 



From a study of the Tertiary leaf beds of Mackenzie river, Grinnell 

 land, Disco, and New Siberia, Melchior Neumayr, of Vienna, proposed 

 to shift the pole 10 degrees toward Bering strait to explain the distri- 

 bution of these subtropical plants in Arctic regions ; and Baron Nathorst, 

 of Stockholm, from a study of the Tertiary flora of Japan, found that 

 the distribution of Miocene plants could best be explained by a transfer 

 of the pole 20 degrees toward the same point.f 



Jules Peroche, in a study of all the fossil floras, lets the pole approach 

 Bering strait as it revolves in a circle of 30 degrees diameter around the 

 magnetic north pole. J 



There appears in Zeitschrift der Deutschen Geologischen Gesellschaft 

 for 1899 § an article by Max Semper, in which the attempt is made to 

 reconstruct the ocean currents of the Eocene and to compare there- 

 with the direction taken by the Eocene mollusca in their wanderings. 

 He finds entire lack of agreement. The currents, however, take direc- 

 tions which favor the known wandering of the East Indian genera west- 

 ward across the Mediterranean and on to Central America, when the pole 

 is transferred 20 or 30 degrees along the meridian 20 degrees east 

 of Greenwich. This brings the pole into western Alaska and very 

 near the point assumed in the foregoing discussion. 



Last year Michel-Levy || published a remarkable map, (plate 13, page 

 74) showing the distribution of volcanic rocks and main mountain chains 

 and fissure systems in tetrahedral symmetry, and placed the pole of the 

 tetrahedron 18 degrees from the earth's pole, near Bering strait. 



Mr Osmond Fisher first suggested that the lessened oblateness should 

 have produced corrugation, and that the lack of indication of any effect 

 such as might have been expected in equatorial regions favors a change 

 of latitude,^! but he dismisses the subject in a sentence. 



Mr W. P. Taylor,** in a valuable article admitting and enforcing the 

 arguments against the sufficiency of the contractional hypothesis to ex- 



*Quar. .lour. G-eol. Soc, vol. xxxiv, p. 3">. 

 t Kokcn : Die Vorwelt, p. 539. 



J Mem. Soc Arch. etd'Hiet. Nat. d. 1. Manche, vol. vii, 18GG. 

 g Volume li, p. 185. 

 }ur la coordination <>t [a repartition de fractures et des effondrements de l'ecoree terrestre en 

 relation avec lea epanchements volcanique. Bull. Geol. Soc. France, .} S.. vol. xxvi, lS9;s, p. 105. 

 fl Physics of the Earth's Cru9t, 1881, p. 183. 

 ** Crumpling of the earth's crust. Am. Jour. Sci., 3d series, vol. xxx, 1895, p. 250. 



