CONTENTS. 



PART I. (1861-62.) 



PAGE 



I. On the Anatomy and Classification of the Heteropoda. By John 

 Denis Macdonald, R.N., F.R.S., Surgeon of H.M.S. " Icarus." 

 (With two Plates, I., If.), ..... 1 



II, Investigation of an Expression for the Mean Temperature of a Stra- 

 tum of Soil, in Terms of the Time of Year. By Joseph D. 

 Everett, M.A., Professor of Mathematics, &c., iu King's Col- 

 lege, Windsor, Nova Scotia, . . . . .21 



III. On a Difficulty in the Theory of Rain. By James Dalmahoy, Esq., 29 



IV. On the Pressure Cavities in Topaz, Beryl, and Diamond, and their 



hearing on Geological Theories. By Sir David Brewster, K.H., 

 D.C.L., F.R.S., 39 



y. On the Theory of Numbers. By H. F. Talbot, Esq., . . 45 



VI. On the Rain- Fall in the Lake District in 1861, with some Observa- 

 tions on the Composition of Rain Water. By John Davy, M.D., 

 F.R.SS. Lond. & Edin., . . . . .53 



VII. On the Structure of the Chondracanthus Lophii, with Observations on 

 its Larval Form. By Wm. Turner, M.B. (Lond.), F.R.S.E., 

 and H. S. Wilson, M.D., Demonstrators of Anatomy in the 

 University of Edinburgh. (With a Plate, III.), . . 67 



VIII. On the Structure of Lerneopoda Dalmanni, with Observations on its 

 Larval Form. By Wm. Turner, M.B. (Lond.), F.R.S.E., and 

 H. S. Wilson, M.D., Demonstrators of Anatomy. (With a 

 Plate, IV.), . . . . . . .77 



IX. On the Deflection of the Plummet due to Solar and Lunar Attraction. 



By Edward Sang, Esq. (With a Plate, V.), . . 89 



