419 



The reason that the prices increase more rapidly than the num- 

 bers of specimens, is the increasing difficulty of procuring varieties 

 of appearance and new species, after collections of a (ew hundreds 

 have been formed. 



Fossils to illustrate the fossil zoology and botany of the transition 

 slates, gray wackes and limestones ; the coal formation and associa- 

 ted rocks; and of the upper, secondary and tertiary formations, will 

 be sent to order at the above rates. 



Geological specimens, two by three inches, will be furnished at 

 two thirds the above rates ; of three by four inches at the above pri- 

 ces. Larger geological specimens will be procured if desired, at a 

 moderately increased price. 



Small mineral specimens will be furnished to those wishing them 

 at reduced prices. 



Plaster of Paris trays to lay the specimens in, in the Cabinet, 

 made very neatly and of perfect whiteness, will be sent to those de- 

 siring them at six dollars per hundred. Individuals or institutions who 

 wish it, can have their specimens put up in elegant cases of draw- 

 ers, or in those made plain, as may suit the views of the purchasers. 



Orders for large collections will be given a year in advance of the 

 time of their fulfillment. Payments are to be made one half in ad- 

 vance on giving the order, the other half on the receipt of the col- 

 lection. 



Orders for collections, or for particular specimens, are to be ad- 

 dressed, post paid, to Messrs. Mather h Hall, No. 95 State-street, 



Albany. 



Albany, Dec. 17th, 183S. 



We recommend the above design and the gentlemen who have 

 undertaken it, as being worthy of confidence. — Ed. 



18. Geology and Mineralogy considered with reference to Natu- 

 ral Theology^ by the Rev. William Buckland, D. D., Canon of 



