Geology and Mineralogy . 73 



mineralogic or paleontologic nature; on the other hand, informa- 

 tion relating to petrography, physical geography, applied geol- 

 ogy, mineral waters, and prehistoric archeology will be included. 

 For the rest, full latitude is left in this respect to the collabora- 

 tors, the editor being empowered to extend or abridge manu- 

 scripts with a view of securing proper uniformity in publication. 



"Important manuscript bibliographies, the existence of which 

 may be known to the members of the committee, are to be indi- 

 cated in the proper places, stating name and address of author. 



"The publication will be in French, but manuscripts may be 

 prepared in the language of the country whence they come, to be 

 translated afterward under the direction of the editor. 



" Titles must always be given in the language of the original 

 pxiblication ; they will not be followed by a French translation 

 except in case they belong to a language other than English, 

 German, Italian or Spanish. The indication of the author's name, 

 place of publication (with the publisher's name in the case of a 

 separate work), date, size and number of pages, shall be as exact 

 and detailed as possible : furthermore it is desired to have stated 

 the approximate number of entries contained in each bibliography, 

 adding summary information regarding its nature, such as: 

 " Alphabetic catalogue by authors' names ; Catalogue classified 

 by order of dates; Simple list of titles; Each article is followed 

 by a resume ; The number of plates is not given, etc." The 

 limiting dates of the publications catalogued in the bibliographies 

 are also to be noted, (e. g. f802 to 1888.) 



" In case a bibliography bears no printed title, which often 

 happens with such. as are appended to special works or memoirs, 

 it will be proper to define its subject by means of a phrase in 

 brackets: [ . . . . ], giving after this the complete title of the 

 document in which the bibliography is comprised. 



" Publications which, without pretending to take the form of a 

 methodic bibliography, contain the detailed history of the study 

 of a question of general interest or of a country, are to be men- 

 tioned. 



"In order to facilitate the final classification of subjects for the 

 purpose of printing, the collaborators are requested to prepare 

 their work on separate slips." 



The Secretary, Emm. de Margerie, 

 To Mr. G. K. Gilbert, Member of the Committee for North 



America. 



2. Experimental researches (I) On the deformations of a Sphere 

 by contraction and pressure, and (2) On the part played by Vapors 

 in different geological phenomena / by Prof. A. Daubree. — 

 Professor Daubree has been continuing his very valuable re- 

 searches in experimental geology by new experiments on the 

 effects produced by pressure and by vapors in different geological 

 phenomena. The effects of contraction, described in the Comptes 

 Rendus, for May, 1890, are obtained by covering a distended ball 

 of caoutchouc, arranged to have the form of a flattened sphe- 



