2 P FEB 1889 



TRANSACTIONS 



OF TUG 



ROYAL SOCIETY OF EDINBURGH. 



VOL. XXXV. PART I.— (Nos. 1 to 7)— FOR THE SESSION 1887-88. 



CONTENTS. 



No. I. On the Number of Dust Particles in the Atmosphere. By John Aitken, Esq. 



(With a Plate), ... . 1 



II, The History of Volcanic Action during the Tertiary Period in the British Ides. 

 By Archibald Geikib, LL.D., F.R.S., Director General of the Geological 

 Survey of tlie United Kingdom. (With Two Maps and Fifty-three 

 Woodcuts), .......... 21 



III. Mean Scottish Meteorology for tlie last Thirty-two Years. By C. Piazzi Smyth, 



late Astronomer-Royal for Scotland, and F.R.S.E., F.R.A.S., Sec. (With 

 Fourteen Plates), . . . . . . . . .185 



IV. Eight Years' Observations of the New Earth Thermometers at tlie Royal Obser- 



vatory, Edinburgh, 1879-1888. By C. Piazzi Smyth, late Astronomer- 

 Royal for Scotland, and F.R.S.E., F.R.A.S., &c. (With Four Plates), . 287 



V. On Neuropteris plicata, Sternberg, ami Xeuropteris rectinervis, Kidston, n. sp. 



By Robert Kmsrox, F.R.S.E., F.G.S. (With a Plate), . . . 313 



VI. On tlie Fossil Flora of tlie Staffordshire Coal Fields. By Robisut Kidston, 



F.R.S.E., F.G.S. (With a Plate), ...... 317 



VII. Experimental Researches in Mountain Building. By Henry M. Cadell, Esq. 

 of Grange, B.Sc, F.R.S.E., H.M. Geological Survey of Scotland. (With 

 Thirty-six Illustrations), ....... 337 



(Issued January 21, 1889). 



