Ill 
Monday , 3d March 1856. 
PAGE 
Observations on the Diatomaceous Sand of Glenshira. Part 
II. Containing an Account of a number of additional 
undescribed Species. By William Gregory, M.D., 
F.B.S.E., Professor of Chemistry in the University of 
Edinburgh, . . . . . 358 
Theory of the Free Vibration of a Linear Series of Elastic 
Bodies. Part II. By Edward Sang, Esq., . 360 
Monday , 17 th March 1856. 
An Account of some Experiments on certain Sea-Weeds of 
an Edible kind. By John Davy, M.D., F.E.S., Lond. 
and Edin., &c., .... 363 
On the Deflection of the Plumb-Line at Arthur’s Seat, and 
on the Mean Density of the Earth. By Lieutenant- 
Colonel James, R.E. Communicated by Professor 
Forbes, ..... 364 
On the Possibility of combining two or more independent 
Probabilities of the same Event, so as to form one de- 
finite Probability. By Bishop Terrot, . 366 
Donations to the Library, . . . . 367 
Monday , 7 th April 1856. 
On Atmospheric Manoscopy, or on the direct Determi- 
nation of the Weight of a given bulk of Air with 
reference to Meteorological Phenomena in general, 
and to the Etiology of Epidemic Diseases. By Dr 
Seller, ..... 368 
Researches on Chinoline and its Homologues. By C. Gre- 
ville Williams. Communicated by Dr T. Ander- 
son, ...... 370 
On Fermat’s Theorem. By H. Fox Talbot, Esq., F.R.S., 371 
