Reports & Proceedings—Geological Society of Glasgow. 41 
production of monazite from the seashore of Travancore marks the 
commencement of a new mineral industry. 
2. On tHe Porosity or tHE Rocks or THE Karroo System In 
Sourn Arrica. By A. L. pu Torr. Trans. Roy. Soc. S. Africa, 
vol. iv, pt. 111, pp. 169-80, 1915. 
The rocks of the Karroo system cover fully one-half of the Union 
of South Africa, and have sometimes been considered capable of 
furnishing important supplies of artesian water. The author has 
made a large number of measurements of porosity and specific gravity 
on fresh specimens from various horizons of the formations represented. 
His results show that the porosity of these rocks is low, and that, 
except where fissures and joints increase the capacity for water 
storage, strong supplies cannot be anticipated. 
3. BrieHron’s Lost River.—Mr. K. A. Martin has contributed to the 
Transactions of the South-Eastern Union of Scientific Societies, 1915, 
a very complete account of the Wellesbourne, a stream which rose 
near the upper end of Patcham Street and entered the sea at the 
Pool, Pool Valley, Brighton. Its operations are now confined by 
a sewer, but in former days it seems to have been the cause of 
frequent flooding and other trouble to the town. 
REPORTS AND PROCHHDINGS. 
ee ——————. 
I.—GerotoctcaL Society or GLascow. 
At a meeting of the above Society held on November 11, the 
office-bearers for the session were elected. 
‘Mr. Alexander Scott, M.A., B.Sc., read a paper on “ Primary 
Analcite and Analcitation”. He discussed the occurrence and form 
of analcite in igneous rocks and reviewed the opinions of various 
authorities concerning it. British and American petrologists 
generally favour the opinion that the mineral is primary, while 
Continental investigators hold the view that it is secondary. The 
chief evidence in favour of the latter theory is the altered condition 
of associated minerals, but this can be shown to be due to reactions 
between the analcite and minerals previously formed; thus felspar is 
replaced by analeite, augite has a rim of soda-pyroxene, and olivine 
and magnetite are surrounded by biotite. These undoubtedly arise 
by the corrosion of the early minerals by a magmatic residuum rich 
in water and soda. The general conclusion is that analcite is primary 
in many rocks, particularly in the great Permo-Carboniferous suite of 
the West of Scotland described by Tyrrell. 
Professor Gregory complimented the author on his paper, and said it 
was satisfactory to find that, while there was ground for the views of 
both the British and the Continental workers, the balance of truth 
lay with the British. 
Mr. G. W. Tyrrell said that in addition to the evidence brought 
forward by Mr. Scott, the fact that analcite is such an important 
constituent (sometimes about 40 per cent) of many rocks points to 
its being a primary ingredient, as such rocks, minus their analcite, 
