[ V ] 
XXII. On the Lunar- Diurnal Magnetic Variation at Toronto. By Major-General 
Edward Sabine, R.A., D.C.L., Treas. ^ V.P.R.S. page 499 
XXIII. Account of the Construction of a Standard Barometer, and Description of the 
Apparatus and Processes employed in the Verification of Barometers at the Kew 
Observatory. By John Welsh, Esq. Communicated by J. P. Gassiot, Esq., 
F.R.S., Chairman of the Kew Observatory Committee of the British Associa- 
tion 507 
XXIV. On the Presence of Fibrils of Soft Tissue in the Dentinal Tubes. By John 
Tomes, Esq., F.R.S., Surgeon-Dentist to the Middlesex Hospital. . . .515 
XXV. On the Problem of Three Bodies. By the Rev. J. Challis, M.A., F.R.S., 
F.R.A.S., Plumian Professor of Astronomy and Experimental Philosophy in the 
University of Cambridge 523 
XXVI. Researches on the Foraminif era . — Part II. Bi/ W illiam B. Carpenter, J/.7)., 
F.R.S., F.G.S. ^c. 547 
XXVII. On the Megatherium (Megatherium Americanum, Cuvier and Blumenbach). 
Part III. — The Skull. By Professor Owen, F.R.S. &;c 571 
XXVIII. On the Deflection of the Plumb-lime at Arthur's Seat, and the Mean Specific 
Gravity of the Earth. Communicated by Lieutenant- Colonel James, R.E., 
F.R.S. , M.R.I.A. 8^c., Superintendent of the Ordnance Survey . . . .591 
XXIX. On the Figure, Dimensions, and Mean Specific Gravity of the Earth, as 
derived from the Ordnance Trigonometrical Survey of Great Britain and Ire- 
land. Communicated by Lieut. -Colonel 3 am¥.^, R.E., F.R.S. 8^c., Superintendent 
of the Ordnance Survey 607 
XXX. A Third Memoir upon Quantics. By Arthur Cayley, Esq., F.R.S. . . 627 
XXXI. The Bakerian Lecture. — On the Electro-dynamic Qualities of Metals. By 
Professor William Thomson, M.A., F.R.S . 649 
XXXII. On the Construction of the New Imperial Standard Pound, and its Copies of 
Platinum ; and on the Comparison of the Imperial Standard Pound with the 
Kilogramme des Archives. By W. H. Miller, M.A., F.R.S., Professor of 
Mineralogy in the University of Cambridge 753 
Index 947 
Presents 
Appendix. 
[ I ] 
