THE 
MONTHLY MICROSCOPICAL JOURNAL. 
MARCH 1, 1877. 
I.—ANNIVERSARY ADDRESS OF THE PRESIDENT, 
H. C. Sorsy, F.R.S., &. 
(Delivered before the Roya Microscorican Society, February 7, 1877.) 
PuaTeE CLXXTIV. 
TABLE OF CONTENTS, 
Introduction. 
The Application of the Microscope to Geology. 
Structure of Stratified Rocks. 
Preparation of the Objects. 
Mounting Deposits in Balsam. 
Visibility of the Objects. 
Object-glasses used. 
On the Microscopical Character of Sands and Clays. 
Origin of the Material, viz. : 
Quartz. 
Quartz in Granite. 
Quartz in Schists. 
Mica, &e. 
Hornblende and Schorl. 
Felspars. 
Pumice. 
Tron Oxides. 
General Conclusions, 
Sorting of the Material. 
Practical Application of the above-described General Principles. 
Identification of the constituent Minerals, viz. : 
Quartz. 
Calcite, &e. 
Mica. 
Hornblende, &e. 
Felspars. 
Kaolin, &e. 
Application of similar Principles to thin Sections of Rocks. 
Application of the above-described Principles to Special Cases, viz. : 
Millstone Grit of South Yorkshire. 
Sand of the Egyptian Desert. 
Sand derived from Schists, Clays, &c. 
Volcanic Ash Beds in British Strata. 
Conclusion. 
Introduction. 
BeE¥ForE commencing the special portion of my address, I think I 
may venture to congratulate the Fellows on the general condition 
of our Society, and on the proceedings of the past year. We have 
had a considerable number of valuable communications, followed by 
very satisfactory discussions. For my own part, I have been 
VoL. XVII. K 
