268 Proceedings of Royal Society of Edinhurgh. [sess. 
Monday, ith January 1892. 
Sir William Turner, M.B., Vice-President, in the Chair. 
The following Communications were read : — 
1. Note on a Theorem regarding a Series of Convergents to the Boots 
of a number. By T. Muir, Esq., LL.D. P. xix. 15. 
2. On the Development of the Lung-books of Scorpio, and the 
Belation of the Lung-books to the Gills of Aquatic forms. By 
Malcolm Laurie, B.Sc., F.L.S. Communicated by Professor Cossar 
Ewart. 
3. On the Number of Dust Particles in the Atmosphere of certain 
Places in Great Britain and on the Continent, with remarks on the 
relation between the Amount of Dust and Meteorological Phenomena. 
Part II. By John Aitken, Esq., F.R.S. T. xxxvii. 17. 
4. The action of the Valves of the Mammalian Heart. (With Lime- 
light Illustrations.) By D. Noel Baton, Esq., M.D. T. xxxvii. 179. 
The following Candidate for Fellowship was balloted for, and 
declared to be a duly elected Fellow of the Society : — 
J. W. Ballantyne, M.D., F.R.C.P.E. 
Monday, IWi January 1892. 
Professor Chrystal, LL.D., Vice-President, in the Chair. 
The following Communications were read : — 
1. On Circular Magnetization accompanying Axial and Sectional 
Currents along Iron Tubes. By Professor G. G. Knott. T. xxxvii. 7. 
2. On Tactics adopted by certain Birds when flying in the Wind. 
By B. W. Western, Esq. Communicated by A. B. Brown, Esq. 
P. xix. 76. 
3. Ptomaines extracted from Urine in certain Infectious Diseases. 
By Dr A. B. Griffiths. P. xix. 97. 
4. On Impact, II. By Professor Tait. T. xxxvii. 381. 
5. On the Critical Isothermal of Carbonic Acid, as given by Amagat’s 
Experiments. By Professor Tait. P. xix. 32. 
Monday, Is^ February 1892. 
Rev, Professor Flint, D.D., Vice-President, in the Chair. 
The following Communications were read : — 
1. The latest Physical Geography from Greenland. By C. PiAZZi 
Smyth, LL.D., F.R.S.E., and late Astronomer- Boyal for Scotland. 
