XXll CONTENTS. 



PART III. (1863-64.) 



PAGE 



XXIX. Description of the Lithoscope^ an Instrument for distinguishing 

 Precious Stones and other bodies. By Sir David Brewster, 

 K H., F.R.S. (With a Plate, XIX.), . . .419 



XXX. On the Agrarian Laws of Lycurgus., and one of Mr G rote's 



Canons of Historical Criticism. By Professor Blackte, . 425 



XXXI. On the Limits of our Knoioledge respecting the Theory of Parallels. 



By Professor Kelland, .... 433 



XXXIT. On the Temperature of Certain Hot-Springs in the Pyrenees. By 

 R. E. ScoRESBY- Jackson, M.D., F.R.C.P.E., Lecturer on Ma- 

 teria Medieaand Therapeutics at Surgeons' Hall, Edinburgh, 451 



XXXIII. On Superposition. By the Rev. Philip Kelland, M. A., F.R.S., 



Professor of Mathematics in the University of Edinburgh. 

 Part II. (Continued from Vol. XXI. p. 273.) (With a 

 Plate, XX.), ...... 471 



XXXIV. On the Variations of the Fertility and Fecundity of Women accord- 



ing to Age. By J. Matthews Duncan, M.D., . . 475 



XXXV. On the most Volatile Constituents of American Petroleum. By 



Edmund Ronalds, Ph.D., . . . . .491 



XXXVI. On Sun-Sj)ots and their Connection tvith Planetary Configurations. 



By Balfour Stewart, M.A., F.R.S., . . . 499 



XX XVI T. On the freezing of the Egg of the Common Fotvl. By John Davy, 

 M.D., F.R.SS. Lond. and Ed., &c. (Communicated by Pro- 

 fessor Maclagan), ...... 505 



XXXVIII. On the Morphological Relationships of the Molluscoida and Coelen- 

 terata^ and of their leading 3Iembers, inter se. By John Denis 

 Macdonald, R.N., F.R.S., Surgeon of H.M.S. " Icarus," . 515 



XXXIX. On the Great Drift Beds with Shells in the South of Arran. By 

 the Rev. Robert Boog Watson, B.A., F.R.S.E., Hon. Mem. 

 Nat. Ver. Luneburg. (With two Plates, XXL, XXII. ), . 523 



