1895.] MICROSCOPICAL JOURT^AL. 335 



Any piece of the Andalusia chalk, as large as a marble, 

 will give this exceptional form of a Triceratium, along 

 with Radiolarians, sponge spicules and a few discoidal 

 diatoms, chiefly Coscinodiscus with the treatment and 

 manipulation suggested in the earlier part of this article. 

 I' think it opportune to state at this point, that if the 

 process given by me herein is duly familiarized, and used 

 by any student, he will have available an open door to a 

 wide range of microscopical truth. If applied in many 

 other directions, it will reveal to him many things of 

 interest, that would otherwise remain hidden from his 

 sight, and therefore be lost to his descriptive powers. 



The time may yet come when the Geological Survey of 

 the United States will find it useful as well as beneficial 

 to have the microscopic structure, contents and compo- 

 sition of all of the Tertiary formations of the United 

 States properly and adequately worked up, and out. In 

 that case, the Micro-geologist, who is now unfamiliar 

 with the beautiful results of Micro-geology, can, after ac- 

 quainting himself with the data thus acquired, write with 

 greater assurance, and more certainty. In the study of 

 the earth's crust, the work of the microscope and its 

 revelations are practically ignored. As a natural conse- 

 quence it will necessitate some future historian to recast 

 and unfold the genesis of the given stratum on a more 

 scientific and accurate basis. This vein of thought was 

 suggested by a partial perusal of the great volumes deal- 

 ing with the Coastal Plain Report recently issued by the 

 United States Geological survey, in which Asisstant W. 

 J. McGee in a masterly manner handles the whole of the 

 Gulf Coastal Plain from Washington, D. C, to Texas. 

 Therein, as a giant commander, he harmonizes and equal- 

 izes the combined work of all antecedent surveys. All 

 this is accomplished without aid from microscopic sources. 

 Among the chiefs entrusted with the direction of State 

 geological surveys is Dr. Eugene A. Smith, Ph.D,, 



