350 
Proceedings of Boyal Society of Edinburgh. [sess. 
3. Exhibition of a Model illustrating a Molecular Theory of Mag- 
netism. By Professor Ewing, F.R.S. 
4. On the Development of Adenoid Tissue. By Dr Gull and. Com- 
municated by Dr A. Bruce. 
Monday , 5th January 1891. 
Professor Chrystal, LL.D., Vice-President, in the Chair. 
The following Communications were read : — 
1. Obituary Notices — 
Sir Henry Yule. By Coutts Trotter, Esq. P. xvii. p. xliii. 
Dr James Duncan Matthews. By Professor MTntosh, 
. F.B.S. P. xvii. p. xxxviii. • 
Rev. James Grant, D.C.L. By A. B. Bell, Advocate. P. 
xvii. p. xxxii. 
2. On the Soaring of Birds ; a continuation of the letter from the late 
Mr W. Froude to Sir W. Thomson. P. xviii. 65. 
3. Further Note on Impact. By Professor Tait. 
Friday , 9 tli January 1891. 
Professor Chrystal, LL.D., Vice-President, in the Chair. 
The following Communications were read : — 
1. On the Form, Structure, and Distribution of Manganese Nodules 
in the Deep Sea (with Specimens). By Dr John Murray. 
2. On the Occurrence of Manganese Deposits in Marine Muds. By 
Robert Irvine, F.C.S., and Dr John Gibson. P. xviii. 54. 
3. On the Composition of Oceanic and Littoral Manganese Nodules. 
By J. Y. Buchanan, Esq., F.R.S. T . xxxvi. 
4. On the Composition of some Deep-Sea Deposits from the Mediter- 
ranean. By J. Y. Buchanan, Esq., F.R.S. P. xviii. 131. 
5. On the Action of Metallic Salts on Carbonate of Lime (with illustra- 
tive Specimens). By Robert Irvine, F.C.S., and W. S. Anderson, 
Esq. P. xviii. 52. 
Monday , 19 th January 1891. 
The Hon. Lord McLaren, LL.D., Vice-President, in the Chair. 
The following Communications were read 
1. Obituary Notice, James Leslie, Memb. Inst. C.E. By Alexander 
Leslie, C.E. P. xviii. p. xvii. 
