1904 - 5 .] 
Meetings of the So'ciety. 
1185 
collected during an expedition specially organised for the purpose 
to the Grand Chaco of South America in the years 1896-1897. 
The general biology and habits of Lepidosiren are described, the 
external features of development are fully dealt with, and in a 
discussion of the general hearings of the phenomena considered, 
reference is made to, amongst other things, the relations of the 
protosoma to the body of the vertebrate ; to the origin of the 
spiral valve ; and to the morphological significance of the external 
gills which it is suggested are the persisting representatives of the 
organs from which the limbs of vertebrates have been evolved. 
The following Communications were read : — 
1. Sequel to a Paper, “On Charcoal Vacua,” by Professors Tait and 
Dewar, read before the Society in 1875 . By Sir James Dewar, LL.D., 
D.Sc., F.R.S. {Illustrated by means of experiments with liquid air.) 
2. The Theory of Continuants in the Historical Order of Develop- 
ment up to 1880 . By Thomas Muir, LL.D. pp. 648 - 679 . 
The following were balloted for, and declared duly elected : — 
As British Honorary Fellows. 
Alfred Uewton, M.A., F.R.S., Professor of Zoology and Com- 
parative Anatomy in the University of Cambridge. 
Joseph John Thomson, D.Sc., LL.D., F.R.S. , Cavendish Professor 
of Experimental Physics, University of Cambridge. 
Sir William Ramsay, K.C.B., LL.D., F.R.S., Professor of 
Chemistry in the University College, London. 
As Foreign Honorary Felloios. 
Moritz Cantor, Hon. Professor of Mathematics, University of 
Heidelberg. 
Wilhelm Wundt, Professor of Philosophy, University of Leipzig. 
Wilhelm Waldeyer, Professor of Anatomy, University of Berlin. 
Eduard Pfluger, Professor of Physiology, University of Bonn. 
Eduard Suess, Em. Professor of Geology, University of Vienna. 
Paul Ehrlich, Director of the Institute for Experimental 
Therapeutics, Frankfurt-a-M. 
Waldemar Chr. Brogger, Professor of Mineralogy and Palae- 
ontology, University of Christiania. 
Paul Heinrich Groth, Professor of Mineralogy in the University 
of Munich. 
PROC. ROY. SOC. EDIN. — YOL. XXY. 
75 
