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The following Papers were read during the Session of 
1860-61 : — 
October 2nd, I860. — “ On the A faced Polyacrons in reference 
to the Problem of the Enumeration of Polyhedra,” by Arthur 
Cayley, F.R.S., &c. 
October 1 6th, 1860. — “On the Estimation of Sugar in Diabetic 
Urine by the Loss of Density after Fermentation,” by William 
Roberts, M.D. 
October 30th, I860 — “ On the Alleged Practice of Arsenic Eating 
in Styria,” by H. E. Roscoe, Ph.D. 
November 13 th, I860 — “On a System of Periodic Disturbances 
of Atmospheric Pressure in Europe and Northern Asia,” by Joseph 
Baxendell, F.R.A.S. 
November 27 th, I860 — “ On the Prevalence of Certain Forms of 
Disease, in connection with Hail and Snow Showers, and the E ! ectric 
Condition of the Atmosphere,” by Thomas Moffatt, M.D., F.G.S. 
Communicated by E. W. Binney, F.R.S., See. 
December 1 1 t/i, I860 “ On the Origin of Species,” by the Rev. 
W. N. Molesworth, M.A. 
January 8 th, 1861 — “On the Nature and Objects of Geological 
Surveys, with Special Reference to the Progress of the Geological 
Survey of Lancashire and Cheshire,” by Edward Hull, B.A., F.G.S* 
Communicated by E. W. Binney, F.R.S., Sec. 
February 5 th, 1861. — “ On the Kaloscope,” by Mr. W. FI. Heys. 
Communicated by Mr. George Mosley. 
February 19 th, 1861 — “ On the Production and Prevention of 
Malaria,” by Dr. II. Angus Smith, F.R.S. 
“Brief Notes on the Freezing, Thiwing, and Evaporation of 
Water, and on the Condensation of Steam,” by J. C. Dyer, Esq. 
March 5th, 1861 “ On the Structure of the Luminous Envelope 
of the Sun,” by James Nasmyth, Esq. Communicated by Mr. 
Joseph Sidebotham. 
“ On Changes of Density which take place in Rolled Copper by 
Hammering and Annealing,” by Mr. Charles O'Neill. 
