HABITAT OF RHAMNUS CAROLINIANA.—The manuals give the habitat of this species “in swamps and on low grounds” (Britton), “swamps and river banks” (Gray), “river banks” (Wood), and “fertile soil” (Chapman). It has been previously reported that this species was found in Ohio last November. Several specimens were found near the Ohio river in Adams county at the mouth of Brush creek, and a few were seen in Brown county. In a little ravine on Cedar creek, a tributary of Brush creek, in Adams county, fourteen miles north of the Ohio river, an enormous number of plants were growing. Some were nine to eleven inches in circumference at the base and fourteen feet high. None occurred in “swamps,” though many were in “low grounds” where the soil seemed to be fairly fertile. The majority were on rocky hillsides or quite on the top of very high ground. The annexed cut shows a specimen near the top of a rocky bluff or hill perhaps one hundred and fifty feet above the valley at Cedar Mills, Ohio. This southern Buckthorn still retained its shining leaves though my visit was late in November when nearly all the other trees except the oaks were bare. This, with the great quantities of black fruits, presented a charming spectacle. The plant is also reported in Stanley Coulter’s catalogue of Indiana plants, discovered in the southern counties by Mr. W. T. Blatchley, “growing on rocky hillsides.” [Illustration: Rhamnus Caroliniana on a rocky hill.] [Illustration: Twin Beech and Red Oak.] TWIN TREES; TWO SPECIES.—Sometimes two trees attempt to occupy the same space at the same time. The cut above shows a red oak and a beech in close juxtaposition, neither having been able to crowd the other out, and the two are united for a short distance from the ground. This would hardly be called a natural graft perhaps, though the two are intimately united. The trees are vigorous typical specimens of the two species, growing near Brush creek, at Arion, in Scioto county, Ohio. Several other examples in the same region were noticed. Sometimes the two trees are the same species, but usually of different species, the union of tissue in all cases equally evident. MEETING OF THE BIOLOGICAL CLUB. A meeting of the Biological Club was held in Zoological Lecture-room January 7, 1901. Professor Osborn presided; twenty-three members present. Mr. Griggs, secretary of the board of editors gave a financial report and recommended that the name of the publication be changed to THE OHIO NATURALIST. By the unanimous vote of the members present, the recommendation was adopted. Professor Hambleton read a paper on his Explorations in southern Chile and Patagonia. He said: