CONTENTS. 

 VOL. VII. 



Continuation of a paper on Square Numbers, &c., read Dec. 22, 1853. 

 By Sir Frederick Pollock, M.A., F.R.S page I 



On a Class of Differential Equations, including those which occur 

 in Dynamical Problems. By W. F. Donkin, M.A., F.R.S 4 



On the Growth of Land Shells. By E. J. Lowe,Esq., F.G.S., F.R.A.S. 8 



Note on the Decomposition of Sulphuric Acid by Pentachloride of 

 Phosphorus. By Alexander Williamson, Ph.D., F.C.S 11 



On a new and more correct method of determining the Angle of 

 Aperture of Microscopic Object-Glasses. By W. S. Gillett, M.A. 16 



On some new Compounds of Phenyl. By Alexander Williamson, 

 Ph.D., F.C.S 18 



Note on an indication of depth of Primaeval Seas, afforded by the re- 

 mains of colour in Fossil Testacea. By Edward Forbes, F.R.S., 

 Pres. G.S. &c 21 



Note on the Melting-point and Transformations of Sulphur. By B. 

 C. Brodie, Esq., F.R.S 24 



On the Structure and Affinities of Trigonocarpon (a fossil fruit of the 

 Coal-measures). By Joseph D. Hooker, M.D., F.R.S 28 



On a peculiar Arrangement of the Sanguiferous System in Terebratula 

 and certain other Brachiopoda. By W. B. Carpenter, M.D., F.R.S. 32 



On a new Series of Sulphuretted Acids. By Dr. August Kekule ... 37 



On the Changes produced in the Blood by the Administration of Cod- 

 liver Oil and Cocoa-nut Oil. By Theophilus Thompson, M.D., 

 F.R.S 41 



On a property of Numbers. By the Rev. James Booth, LL.D., F.R.S. 42 

 On Fessel's Gyroscope. By C. Wheatstone, Esq., F.R.S 43 



Account of Researches in Thermo- Electricity. Bv Professor W. 

 Thomson of Glasgow, F.R.S '. 49 



An Introductory Memoir upon Qualities. By Arthur Cavley, Esq., 



F.R.S 58 



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