YALE EDUCATOR HEARD IN TALK Dr.Charles Schuchert Traces Development of Geology. "Nature works in rythms and in circles, whether her immediate task be production of river or mountain," declared Dr. Charles Schuchert, vis- itng professor of geology at the University of Texas, in a lecture on "The Coming and Going of Seas and Mountains," declared Wednesday night on the university campus. Dr. Schuchert is professor emeritus of paleontology at Yale university. "The rain is born of the ocean, and to the ocean it returns with the spoils of the land. It is now known that the oceans have spread peri- odically and more or less widely over the North American continent at least 20 times," Dr. Schuchert said. He traced the development of sedimentary land waste brought down by rivers forming deltas and marine deposits into solid beds of rock. This is shown by the delta of the Mississippi river, which be- gan to form about 38 miles north of Cairo, Ill., back in medieval times, according to Dr. Schuchert. Since then it has gradually built itself out into the gulf for 1100 miles, he said. What had long been a mystery to geologists—the movement of the earth locally up and down—Dr. Schuchert explained was formerly thought due to the cooling of the earth and its consequent shrinking from time to time, is now explained by the lately discovered radioactiv- ity of rocks. The third lecture of this series will be given on Thursday evening, March 4, at 7:30 in K hall.