462 ScientijiG Intelligence, 



pallasites). Further, E. Octahedrites, or irons with octahedral 

 structure ; F. Hexahedrites or cubic irons, and finally, G. Ataxites, 

 or those in which the iron is closely compact and does not show 

 the crystalline structure characteristic ot E and F. These groups 

 are further divided into sixty-one classes, under each of which 

 the specimens belonginpr to it are given and its peculiar features 

 described, often with illustrations. This catalogue is a highly 

 important contribution to our knowledge of meteorites in general. 



10. Phosphate deposits in Tennessee. — Prof, J. M. S afford has 

 recently described a new occurrence of phosphate rock in Central 

 Tennessee, which promises to be of much economic importance. 

 The locality now opened is in the town of Mt. Pleasant, in 

 Maury County, where the phosphate is found in banks from three 

 to eight feet in vertical thickness. The rock is light yellowish or 

 grayish in color, of an open, spongy structure, and occurs in lay- 

 ers or plates from one to six inches or more in thickness piled 

 together in stratified masses. Analyses show that it consists of 

 from 60^ to 80^ of calcium phosphate, with calcium carbonate, etc. 



This phosphate rock has been derived from limestone of Trenton 

 age, particularly the " Capitol limestone," through a long con- 

 tinued process of leaching by carbonated waters, which have dis- 

 solved away the calcium carbonate and left the less soluble layers 

 of phosphate. The source of the phosphate in the original lime- 

 stone is yet in doubt. — Amer. Geol., Oct. 1, 1896. 



11. National Academy of Sciences. — The following is a list of 

 the papers presented for reading at the meeting of the Academy 

 held at New York, Nov. IV and 18 : 



A. Michael: On certain positive-negative laws in their relation to organic 

 chemistry. 



0. C Marsh: The Jurassic formation on the Atlantic coast. 



Ira Remsen : The hydrolysis of acid amides. The isomeric chlorides of parani- 

 troorthosulphobenzoic acid. 



Alfred M. Mayer: The equations of the forces acting in the flotation of disks 

 and rings of metal, with experiments showing the floating of loaded disks and 

 rings of metal on water and on other liquids. 



E. D. Cope: On the geographical aistribution of Batrachia and Reptilia in the 

 Medicolumbian region. 



S. Newcomb: On the physical causes of the periodic variations of latitude. On 

 the solar motion as a gauge of stellar distances. 



C. A. White : Memoir of F. B. Meek. 



A. E. Verrill: The evolution and pylogeny of GTastropod Molluscs. 



0. N. Rood: On flicker photometers. 



C. S. Hastings : A new type of telescope free from secondary color, 



0. S. Peirce: a graphical method of logic. Mathematical infinity. 



