Editorial Coiinncnf. 37.3 
d) P y r g c II i c rocks of chemical origin by means of 
heat. 
e) C r y s t o g c II i c or crystalline rocks of doubtful 
origin on account of their crystallization. 
The subdivisions of these groups are, as far as possible, 
equally based upon their mode of fomiation. 
The third division is of the Cretacic fossils of the country. 
The fourth is the Geotechnical collection, including orna- 
mental marble, slate, etc. 
The fifth is the Alorphological collection (Erosion, actual 
consolidation, organic perforation, etc. 
The sixth is of geological maps, profiles, photographs etc. 
Room II. The hall of regional geolog}^ (collections of the 
western Alps and of the Southern Jura), etc. 
III. Paleontology ( Fossil mammals ; Birds, Reptiles and 
Fishes, etc. 
IV. Mineralogical hall, etc. 
This is an unusal arrangement, especially that of the first 
division with its miscellaneous department at the $nd. 
Far different is Curator Merrill's "Guide to the study of the 
collections in the Section of applied Geology." 
The non-metallic Minerals by George P. INIerrill. (From 
the report of the Smithsonian Institution for 1899, pp. 155 to 
483 with thirty plates. "\\'ashington. Government printing 
office, 1901." 
The 328 pages of this useful catalogue interspersed with 
plates and cuts follow the general classification of Dana in 
general in the groups which are I. The Elements. II. Sul- 
phides and arsenides. III. Halides. I\'. Oxides. V. Car- 
bonates. IV. Silicates. A II. Xiobates and Tantalates. VIII. 
Phosphates. IX. Xitrates. X. liorates. XI. Uranates. XII. 
Sulphates. XIII. Hydro-carbon compounds. XI\^ Miscella- 
neous, 
Under these latter it is to be regretted that the Mineral 
Waters are stowed, as if in the way. They deserve a sepa- 
rate chapter like the rest. The lack of a proper bibliography 
of mineral waters of the Cnited States was felt when Daubree 
was writing his great work on Les Eaux Souterrairies ; and 
sought in vain for systematic infomiation on the subject in this 
country. Little more than the advertising sheets of rival min- 
