1G2 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



phosphate of uranium and barium, in appearance very sim- 

 ilar to aut unite. Occurs in quartz veins in the granite of 

 Falkenstein, Saxon Voigtland. 



I < nerite. A name given by Dr. T. Sterry Hunt to a hy- 

 drous silicate of copper, which forms the mass of the "clay 

 ore" mined in Berks County, Pa. 



Waluerite. A hydrous silicate of aluminum, calcium, and 

 magnesium, allied to xanthophyllite; in external appearance 

 very similar to clinochlore. Described by Kokscharof as 

 occurring near Achmatowsk, in the Southern Ural. 



Youngite. A hypothetical mineral of unknown locality, 

 supposed by Hannay to be a sulphide of zinc, manganese, 

 and lead. 



Zircarbite. A massive yellowish-brown mineral, of un- 

 known chemical composition, occurring at the granite quar- 

 ries of Kockport, Mass. Named by Professor Shepard. 



METEORITES. 



M. Daubree has carried on a series of experiments with 

 dynamite, investigating the effects produced upon a block 

 of steel when a charge has been exploded upon it under dif- 

 ferent conditions. The object of these experiments was to 

 obtain an explanation for some of the most commonly occur- 

 ring; characters of meteorites. The result of his investi^a- 

 tions showed that the effects produced upon the steel which 

 had been subjected to the explosion w r ere throughout com- 

 parable to those produced upon the meteorites by their pas- 

 sage through the atmosphere of the earth. This was true of 

 the irregular fragments formed, the pitted condition of the 

 surface, the striations of the surfaces which had been rubbed 

 together, the cracks, and the marbled surfaces. 



The Conclusion to which he comes, from the facts that have 

 been stated, is that the meteorites owe their distinctive char- 

 acters to the pressure of the atmosphere against them, as 

 they move through it with immense velocity, and to the heat 

 thus generated this pressure being analogous to that which 

 acted upon the steel at the moment of the explosion of the 

 dynamite. 



The so-called meteoric iron of Ovifak, near Disco, Green- 

 land, has been the subject of several recent papers. A prom- 

 inent one by Steenstrup deserves to be mentioned. He de- 



