SECTIONAL TRANSACTIONS.—C. 419 
SECTION C.—GEOLOGY. 
(For references to the publication elsewhere of communications entered in 
the following list of transactions, see p. 464.) 
Thursday, September 8. 
1. Prof. T. J. Jenv.—The Geology of the Edinburgh District. 
2. Prof. L. W. Conter.—On the Origin of the Swiss Lakes. 
3. Presidential Address by Dr. J. S. Furrr, F.R.S., on Haperi- 
mental Geology. See p. 56. 
Friday, September 9. 
4, Joint Meeting with Section K. Discussion on The Oldest Land 
Flora opened by 
Prof. W. H. Lana, F.R.S.—The Flora of the Rhynie Chert Bed. 
(1) List of Plants. 
Vascular Cryptogams. Rhynia Gwynne-Vaughani, R. major, Hornea 
Lignieri, Asteroxylon Mackiet. 
Fungi. Numerous saprophytic forms ; hyphz usually non-septate, bear- 
ing vesicles or resting spores. 
Alge. Algites (Palawonitella) Cranii; the vegetative organs suggest 
comparisons with Characee. 
Schizophyta. Archeothrix oscillatoriformis and probably unicellular 
bacteria. 
Incerte sedis. Nematophyton Taiti. 
(2) The ascertained succession of the plants throughout a vertical section of 
the chert bed. 
(3) Indications of conditions of accumulation of the deposit. 
(4) Interest of the vascular plants. Comparative morphology and affinities. 
Physiological anatomy ; probable habitat and mode of life. 
(5) Interest of the occurrence of Nematophyton in the deposit. 
5. Prof. L. W. Couuet.—Alpine Tectonics. Followed by a discus- 
sion on Alpine and Scottish Tectonics. 
Monday, September 12. 
6. Mr. H. M. Caperu.—Evidence from recent Bores in the Carboni- 
ferous Rocks of Scotland. Followed by a discussion on The 
Search for Oil in Scotland, 
7. Joint Meeting with Section G. Discussion on The Mid-Scotland 
Canal. 
Tuesday, September 13. 
8. Joint Meeting with Sections A, D, and K. Discussion on The 
Age of the Harth. See p. 413. 
9, Mr. F. Drxry.—The Magnesian Group of Igneous Rocks. 
Rocks rich in magnesium are abundantly developed amongst the older rocks 
of the Earth’s crust, and it is proposed in this paper to distinguish them as a 
Magnesian Group of Igneous Rocks. The rocks of this group are characterised 
mainly by richness in magnesium and iron, especially in the less siliceous 
varieties, and by wide variation in silica content. Hypersthene is usually in 
large amount, and in many cases garnet is a common constituent. These rocks 
are developed in a number of Magnesian Provinces, of which Southern India 
may be regarded as a typical example. Rocks belonging to the Magnesian Group 
were erupted much more extensively and more frequently in pre-Cambrian than 
