Report on a Manuscript Work of M. Andre. 315 



century have proposed questions; they have already an- 

 swered some, and have indicated the only means by which 

 the remainder may be resolved. The series of problems is 

 proposed, and nothing but enlightened perseverance is 

 wanted to fill up the outline which constitutes the science. 



It is not foreign to the object of our report to present 

 here, as an example, some of the principal objects which 

 jappear to us necessary to be profoundly studied, in order to 

 make geology a science of facts, and before attempting, 

 with any hope of success, to answer the grand problem of 

 the causes which have reduced our globe to its actual state. 

 To this end we ought, 



1st, To search if the division of great chains in one middle, 

 and two lateral banks or dikes, observed by Pallas, and de- 

 veloped by Deluc, is invariable, and examine, as Ramond 

 has done on the Pyrenees, the causes which sometimes con- 

 ceal them. 



2dly, To examine if there is also any thing certain or uni- 

 form in the succession of secondary strata, if such a kind 

 of stone is always below such another, and vice versa. 



3dly, To operate in a similar manner on the fossils, de- 

 termine the species which appear the first, and those which 

 are only seen afterwards ; discover if these two sorts never 

 accompany each other, if there are any alternations in their 

 appearance ; that is, if the first found appear a second time, 

 and if the second have then disappeared, 



4th, To compare the fossil with the living species more 

 minutely than has hither been done, and determine if there 

 is any relation between the antiquity of the beds, and the 

 similarity or dissimilarity of fossils with the living beings. 



5th, To determine if there is any uniform relation of cli- 

 mate between fossils and those living beings which most re- 

 semble them ; as for example, if they have migrated from 

 the north to the south, the east to the west, or ir there have 

 been mixtures and irradiations. 



6th, To determine what fossils have lived where they are 

 now found, what others have been transported there, and if 

 there are, in this respect, uniform rules with regard to the 

 Strata, species, or climates. 



