Quercus (Erythrobalanus) radiata n. sp. Twigs stout, densely yellowish-tomentose, remaining somewhat velvety for several seasons. Buds rounded, small (2-3 mm. in diameter), somewhat tomentose. Leaves large (9-13 cm. long and broad), deciduous, pandurate-orbicular, at most deltoid-pointed, cordate-auriculate, not hollowed between the radiate aristate ends. of the veins, dull and glabrous except for the impressed veins above, detachably rusty-tomentose beneath with the denuded surface somewhat bullulate; petiole yellow-tomentose, 3 x 10-15 mm. Flowers unknown. Fruit annual, very small, in somewhat loosely yellowstellate spikes 60-80 mm. long, densely fruited above the middle; cup very small (7-8 mm.), hemispherical, with thin appressed blunt fulvous-tomentose scales; acorn elongated ovoid, 8 mm. long, canescent. Western Sierra Madre of Mexico (Rose, 2230, Aug. 13, 1897), from the top of the range near Santa Teresa, Tepic, the type in the United States National Herbarium, for the privilege of studying which I am indebted to Dr. Rose, of that institution. Quercus (Erythrobalanus) Conzattii n. sp. Twigs stout, gray-tomentose even through the second year. Buds ovoid, rather small (3x5 mm. or more), somewhat hairy. Leaves large (8-10x9-12 cm.), deciduous, orbicular, very obtuse to short-acuminate, cordate, very slightly hollowed between the tips of the aristate veins, glossy, glabrous except for the impressed veins and convex above, densely grayish-woolly beneath; petiole graytomentose, 3 x 5-15 mm. Flowers unknown. Fruit annual, small, in woolly spikes 40-50 mm. long, densely fruited throughout; cup small (scarcely 10 mm.), hemispherical, with thin appressed blunt glabrate scales; acorn ovoid, scarcely 10 mm. long, canescent. Southern Cordillera of Mexico, at 2,000 m. (Conzatti, 1900, June 29, 1907), from the Cuesta de Huauchillo, Nochixtlan, Oaxaca, -the type in the herbarium of the Field Museum at Chicago, for the privilege of studying which I am indebted to Dr. C. F. Millspaugh, of that institution. EXPLANATION OF PLATES. Illustrations, reduced one half, of the types of Quercus Urbani, Quercus radiata and Quercus Conzatti; from photographs by the author. THE FIXED GLACIAL ANTICYCLONE COMPARED TO THE MIGRATING ANTICYCLONE. BY WILLIAM HERBERT HOBBS. (Read April 24, 1920.) 66 The discussion upon the General Air Circulation over the Antarctic" contained in Dr. Simpson's final report upon the meteorological observations made in connection with Captain Scott's last expedition, is devoted especially to my theory of the glacial anticyclone and the opposite conception of the glacial cyclone as set forth by Meinardus, the meteorologist of the German South-Pole Expedition. Simpson's summing up of his conclusions is, however, a trifle difficult to evaluate, for he says: On considering the whole of Hobbs' paper one cannot help feeling that in spite of his failing to explain the origin of the precipitation and the mechanism of blizzards he has made out a very strong case for the existence of an anticyclone over all extensive masses of inland ice and over the Antarctic in particular. Therefore one would be inclined to agree with the generally accepted idea that there is an intense anticyclone concentric with the Pole and covering the whole of the Antarctic Continent. “On the other hand, however, Meinardus in his discussion of the results of the Gauss Expedition attacks the theory of the Antarctic anticyclone with great vigour and one must admit with most convincing success. We will therefore now examine the problem from Meinardus' point of view." decide whether Dr. The following cita From these paragraphs one is unable to Simpson favors the one or the other theory. tions from his monograph will indicate that he has failed to grasp the fundamental physical fact which is the raison d'être of the anticyclone, namely, the domed surface of the continental glacier: 'Hobbs . . . contends that an anticyclone exists over every extensive snow-covered land and takes the Antarctic and Greenland as the two most 1 George C. Simpson, D.Sc., F.R.S., Meteorology, British Antarctic Expedition 1910-1913, Vol. 1, discussion (pp. 326, pls. 5) and Vol. 2, Weather Maps, Calcutta, 1919. |