CONTENTS. xxv 



PAGE 



XXI. Additional Observations on the Polarisation of the Atmosphere, 

 made at St Andrews in 1841, 1842, 1843, 1844, and 1845, 

 By Sir David Brewster, K.H., D.C.L., F.R.S., &c, 247 



XXII. On the Laivs of the Fertility of Women. By J. Matthews 



Duncan, M.D., ...... 287 



XXIII. On some Laws of the Sterility of Women. By J. Matthews 



Duncan, M.D., . . . . . .315 



XXIV. On a New Property of the Retina. By Sir David Brewster, 



K.H., D.C.L., F.R.S., &c, . . . .327 



XXV. On the Classification of Chemical Substances, by means of Generic 



Radicals. By Alexander Crum Brown, M.D., D.Sc, . 331 



XXVL Some Observations on Incubation. By John Davy, M.D., F.R.SS. 



Lond. and Edin., . . . . . .341 



XXVII. Report on the Hourly Meteorological Register kept at Leith Fort 

 in the Years 1826 and 1827. By Sir David Brewster, 

 K.H., D.C.L., F.R.S. (With two Plates, XXIV., XXV.), 351 



XXVIII. On the Buried Forests and Peat Mosses of Scotland, and the Changes 

 of Climate which they Indicate. By James Geikie, Esq., of 

 the Geological Survey of Great Britain. Communicated 

 by Archibald Geikie, Esq., F.R.S., . . . 363 



XXIX. A Notice of Recent Measures at the Great Pyramid, and some De- 

 ductions flowing therefrom. An Address delivered to the 

 Royal Society, Edinburgh, at the request of the Council, 

 by Professor C. Piazzi Smyth, Astronomer Royal for Scot- 

 land. (With three Plates, XXVI.-XXVIII.), . . 385 



XXX. Observations on Neiv Lichens and Fungi collected in Otago, New 

 Zealand. By W. Lauder Lindsay, M.D., F.L.S., Honorary 

 Fellow of the Philosophical Institute of Canterbury, New 

 Zealand. (With two Plates, XXIX., XXX.), . . 407 



VOL. XXIV. PART III. g 



