"3V. 91 



TRANSACTIONS 



OF THE 



EOYAL SOCIETY OF EDINBURGH. 



VOL. XXXVII. PART III.— (Nos. 25 to 29)— FOR THE SESSION 1893-94. 



CONTENTS. 



l'AGK 



XXV. On Lepidophloios, and on the British Species of the Genus. By Robert Kidston, F.E.S.E., 



F.G.S. (With Two Plates), . ....... 529 



XXY1 On the Fossil Flora of the Soutli Wales Coal Field, and the Relationship of its Strata to 

 the Somerset and Bristol Coal Field. By Robert Kidston, F.R.S.E., F.G.S. (With 

 a Plate), .......... 505 



XXVII. On Bistratijication in the Growth of Languages, loith Special Reference to Greek. By 



Emeritus Professor Blackie, . . . . . . . .615 



[XVIII. On the Number of Dust Particles in the Atmosphere of Certain Places in Great Britain and 

 on the Continent, ivith Remarks on the Relation between the Amount of Dust and 

 Meteorological Phenomena. Part III. By John Aitken, F.R.S. (With Three 

 Plates), .......... 621 



XXIX. On the Variations of the Amount of Carbonic Acid in the Ground-Air {Grund-Luft of 

 Pettenlwfer). By C. Hunter Stewart, B.Sc., M.B. (From the Public Health Labora- 

 tory of the University of Edinburgh.) (With Three Plates), .... 695 



EDINBURGH: 



PUBLISHED BY ROBERT GRANT & SON, 107 PRINCES STREET, 

 AND WILLIAMS & NORGATE, H HENRIETTA STREET, COVENT GARDEN, LONDON. 



MDCCCXCIV. 



(Issued October 15, 1894.) 



