PI100EED.INGS OP 

 THE ROYAL SOCIETY. 



VOL. XV. No. 93. 



CONTENTS. 



May 2, 1867. p^e^E 



I. Optics of Photography. — On a Self-acting Focus-Equalizer, or the means of 

 producing the Differential Movement of the two Lenses of a Photographic 

 Optical Combination, which is capable, during the exposure, of bringing 

 consecutively all the Planes of a SoUd Figure into Focus, without altering 

 the size of the various images superposed. By A. CLArDET, F.E..S. . . 456 

 II. On the Grenera Seterophyllia, 'Battersbyia^ Palceocyclus^ and Asterosmilia ; 

 the Anatomy of their Species, and their Position in the classification of the 

 Sclerodermic Zoantharia. By Dr. P. M. Dttncan, Sec. Gr.S. . . . . .460 



III. Contribution to the Anatomy of Hatteria {RhynchocephaluSy Owen) . By 



Albeet G-unthee, M.A., Ph.D., M.D 460 



IV. On the Curves which satisfy given conditions. By Prof. Catley, F.R.S. 462 

 V. Second Memoir on the Curves which satisfy given conditions ; the Principle 



of Correspondence. By Professor Catley, F.E..S 463 



May 9, 1867. 



I. On the Development and Succession of the Teetli in the Marsupialia. By 

 William Heney Flowee, F.R.S., F.R.C.S., &c., Conservator of the Mu- 

 seum of the Royal College of Surgeons of England 464 



II. On a Property of Curves which fulfil the condition + ^^t=0. By W. 



J. Macqtjoen Rakkine, C.E., LL.D., F.R.SS.L. & E 468 



III. A Tabular Form of Analysis, to aid in tracing the Possible Influence of 

 Past and Present upon future states of Weather. By S. Elliott Hoskins, 



F.R.S., &c 470 



lY. Monthly Magnetic Determinations, from June to November 1866 inclusive, 

 made at the Observatory at Coimbra, by Professor J. A. de Sottza, Director 

 of the Observatory. With a Note by the President 474 



May 16, 1867. 



I. On the Internal Distribution of Matter which shaR produce a given Potential 



at the Surface of a Grravitating Mass. By G. Gr. Stokes, M.A., Sec. R.S. 482 

 II. On the IntegrabiUty of certain Partial Differential Equations proposed by 



Mr. Airy. By R. Moon, M.A., late Fellow of Queen's CoUege, Cambridge. 486 

 III. On the Lunar Atmospheric Tide at Melbourne. By Dr. Gr. Neumayee . . 489 

 lY. On the Occlusion of Hydrogen Gas by Meteoric Iron. By Thomas GIea- 



HAM, F.R.S 502 



Y. Further Observations on the Structiu'e and Affinities of lEozoon Canadense. 

 In a Letter to the President. By William B. Caepentee, M.D., F.R.S., 

 F.L.S., F.a.S 503 



May 23, 1867. 



I. On the Intimate Structure of the Brain. — Second Series. By J. Lockhaet 



Claeke, Esq., F.R.S. 509 



II. On Pyrophosphoric Acid with the Pyro- and Tetra-phosphoric Amides. By 



J. H. Gladstone, Ph.D., F.R.S 510 



III. Ovihos moschatus (Blainville). By W. Boyd Dawkins, M.A., F.G.S. . . 516 

 lY. Variations in Human Myology observed during the Winter Session of 



3.866-67 at King's College, London. By John Wood, F3.C.S., Demon- 

 strator of Anatomy 518 



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