. Scientific American 74 Volume Numéro 14 (avril 1896). e serait con-considérées bien même en France.  ?"" Un trottoir utilisé à Vienne se compose de liège granulé minéral mélangé à l'asphalte et autres substances, l'ISBE ?sive comprimée en blocs de suital)le sizeand forme. Parmi les nombreux avantages mis forthin son nom sont la propreté, noiselessness, durabilité, élasticité, l'absence de glissement, qu'ordry humide, et un coût modéré. Contrairement aux bois, trop, c'est non absorbante et, par conséquent, Inodorous. Il presentsthe résistance minimale à la traction, et d'être elasticunder, passant des charges, n'a

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. Scientific American Volume 74 Number 14 (April 1896). e would be con-sidered fine even in France. ?»» A PAVEMENT used in Vienna consists of granulated cork mixed with mineral asphalt and other cohi ?sive substances, compressed into blocks of suital)le sizeand form. Among the numerous advantages set forthin its behalf are cleanliness, noiselessness, durability, elasticity, freedom from slipperiness, whether wet ordry, and moderate cost. Unlike wood, too, it Is non-absorbent, and consequently Inodorous. It presentsthe minimum resistance to traction, and, being elasticunder passing loads, does away with the vibrationcaused by heavy teaming. The blocks are embeddedin tar, and rest upon a concrete base six Inches thick.When taken up for examination they have exhibited, when compared with new ones, a reduced thicknessby wear of less than one-eighth inch—this in the caseof a section of a London street leading to the GreatEastern Railway station, subjected to continuousheavy traffic, the blocks having been in use nearlytwo vears.. Fig. 8.-EDIS0NS STJBOEONS X BAY AFFABATUS. had but little effect in dimming the image. Theimportance of this apparatus to the surgeon can-not be over-estimated. It will give him an instantdiagnosis of his case. The photographic method in-volves long exposure, in itself an evil, followed by theslow development and drying of the plate, and, worstof all, the uncertainty of getting any result whatever.The fluoroscope tells the story at once. Outside ofthe surgeons practice, it will be of great use to all ex-perimenters with X rays, as giving them an instantvaluation of their tubes and of their ezcitatio.. A inountaln of Solid Granite. BY WALPRED WILSON. In Burnet County, Texas, rising abruptly out of thelevel prairie, is a mountain of solid granite as smoothand bald as a negros head without hair. It covers anarea of seventy-five acres and rises two hundredfeet above the surrounding surface. It contains, above the level of the base, one hundred mill

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