BY the death on July 2 of Jethro Justinian Harris Teall, one of the most noted and revered of living geologists has been lost to science. Accomplished in all branches of geology, he gained a world-wide reputation more especially as a pioneer in petrography, at a time when the study of igneous and metamorphic rocks was as yet in its infancy. Born on January 5,1849,ne was tne son of Jethro Teall by his marriage with-Mary, daughter of Justinian Hathaway, of Gloucestershire. On leaving school he went to St. John's College, Cambridge, and by so doing contributed to the development of the noted school of geology which was then coming into existence under Bonney's auspices. He was bracketed second in the first class of the Natural Science Tripos_in 1872, and in 1874 was awarded the Sedgwick Prize for his researches on the Lower Greensand. He held a fellowship at his college from 1875 until 1879.