VI 
Contents. 
12. On an Electrically Controlled Thermostat and other Apparatus for the Accurate 
Determination of the Electrolytic Conductivity of Highly Conducting 
Solutions. By John Gibson, Ph.D., and G. E. Gibson, B.Sc. Issued separately 
February 18, 1910, ........ 
13. The Theory of Orthogonants in the Historical Order of Development up to 1860. 
By Thomas Muir, LL.D. Issued separately February 26, 1910, 
14. The Restoration of an Ancient British Race of Horses. By J. C. Ewart, F.R.S., 
University of Edinburgh. Issued separately February 26, 1910, 
15. Current Observations in Loch Garry. By E. M. Wedderburn, W.S. Issued 
separately March 8, 1910, ....... 
16. On a New Species of Cactogorgia. By James J. Simpson, M.A., B.Sc., Carnegie 
Research Fellow, Natural History Department, University of Aberdeen. 
(With One Plate.) Issued separately March 10, 1910, . 
17. The Development of the Autonomic Nervous Mechanism of the Alimentary 
Canal of the Bird. By Williamina Abel, M.D., Carnegie Scholar. (From the 
Physiological Department, University of Glasgow.) (With Four Plates.) 
Issued separately March 25, 1910, ...... 
18. The Glenboig Fireclay. By J. W. Gregory, D.Sc., F.R.S. (L. and Ed.), Professor 
of Geology in the University of Glasgow. (With One Plate.) Issued 
separately April 8, 1910, . 
19. Tuesite — A Scotch Variety of Halloysite. By J. W. Gregory, D.Sc., F.R.S., 
Professor of Geology in the University of Glasgow. Issued separately 
April 8, 1910, ......... 
20. Contributions to the Chemistry of Submarine Glauconite. By W. A. Caspari, 
B.Sc., Ph.D., F.I.C. Communicated by Sir John Murray, K.C.B., F.R.S. 
Issued separately April 8, 1910, ....... 
21. A Chemical Investigation into the Nature of the Clay Substance in the Glenboig 
Fireclay. By D. P. M c Donald, M.A., B.Sc., Baxter Demonstrator in Geology 
in the University of Glasgow. Communicated by Professor J. W. Gregory. 
Issued separately April 20, 1910, 
22. Borel’s Integral and g-Series. By Rev. F. H. Jackson, M.A. Issued separately 
April 20, 1910, ......... 
23. Proposals for an Anemometer and a Portable Barometer. By J. T. Morrison, 
M.A., B.Sc., Professor of Applied Mathematics, Victoria College, Stellenbosch, 
Cape Colony. Issued separately May 7, 1910, . 
24. The Theory of Bigradients in the Historical Order of Development up to 1860. 
By Thomas Muir, LL.D. Issued separately May 7, 1910, 
25. The Theory of Persymmetric Determinants in the Historical Order of Develop- 
ment up to 1860. By Thomas Muir, LL.D. Issued separately June 16, 1910, 
26. A Method for determining Boiling-Points under Constant Conditions. By Alex 
ander Smith and Alan W. C. Menzies. Issued separately June 16, 1910, 
27. A Common Thermometric Error in the Determination of Boiling-Points under 
Reduced Pressure. By Alexander Smith and Alan W. C. Menzies. 
(Abstract.) Issued separately June 16, 1910, . 
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