Geology and Natural History. 87 



crust ; a second thin layer (0-02 to 0'03 mm thick) of brownish 

 glass, slightly biref ringent ; a third layer, 0-02 to 0*1 mm in thick- 

 ness, consisting of grains of the silicates, olivine and enstatite ; a 

 fourth layer, from 0-1 to 0*4 mm in thickness, consisting of the sili- 

 cates but with an abundance of opaque matter among them ; this 

 is partly metallic, partly amorphous and glassy. As a whole the 

 stones belong to the group of veined-gray chondrites, consisting 

 largely of round chondrules mixed with others of angular or 

 fragmentary form. The analyses of the soluble and insoluble 

 portions made it possible to obtain an approximate determination 

 of the mineralogical composition, as follows: Olivine 45-0 p. c, 

 enstatite 27*8, aluminium silicate 13 - 0, nickel-iron S - 5, troilite 

 4"5, chromite 0*8, schreibersite 0*4 = 100. The olivine approaches 

 fayalite with a ratio of Mg : Fe = 3 : 1. The nickel-iron gave the 

 composition Fe 91'08 p. c, Ni 8-44, Co 0-48 = 100. The specific 

 gravity of the entire stone was determined as 3*499. 



9. Bulletins of the New York State Museum. — No. 83. — Pleis- 

 tocene Geology of Mooers Quadrangle ; by J. B. Woodworth. 

 Pp. 60, pis. 25, and 1 map. 



No. 84. — Ancient Water Levels of the Cham plain and Hudson 

 Valleys ; by J. B. Woodworth. Pp. 265, pis. 28, and 1 map. 



No. 85.— Hydrology of the State of New York ; by G. W. 

 Rafter. Pp. 902, pis. 45, maps 5, text-figs. 74. 



No. 87. — Archeology to Perch Lake Mounds ; by W. M. 

 Beauchamp. Pp. 82, pis. 12. 



No. 88.— Check List of the Mollusca of New York ; by E. J. 

 Letsojst. Pp. 112. 



No. 89. — Aboriginal Use of Wood in New York ; by W. M. 

 Beauchamp. Pp. 87-272, pis. 35. 



No. 91. — Higher Crustacea of New York City; by F. C. 

 Pattlmier. Pp. 117-189. 



10. Bibliographical Index of North American Fungi • by 

 William G. Farlow ; Vol. i, Part 1, Abrothallus to Badhamia, 

 pp. xxxv 4- 312. Washington, 1905 (published by the Carnegie 

 Institution). — The publication of this valuable Index, which has 

 been in preparation for more than thirty years, is an event of 

 much importance not only to the professional mycologist but also 

 to the more general botanist. The purpose of the work is very 

 comprehensive ; it aims to include all the references to North 

 American Fungi, except those which are wholly lacking in inter- 

 est from the standpoint of systematic mycology. As originally 

 planned the Index was to include only those species which occur 

 north of Mexico. The limits were afterwards extended and now 

 take in the West Indies and the whole of the North American 

 continent north of the Isthmus of Panama. The magnitude of 

 the work is at once apparent when it is considered that this first 

 part scarcely goes beyond the first letter of the alphabet. 



So far as possible the Sylloge Fungorum of Saccardo and 

 the Pflanzenf amilien of Engler and Prantl have been followed in 

 their limitations of genera and species and in their classification. 



