242 Geological Society of Glasgow, 



long narrow folia3 cohering together, rendering the mineral almost 

 fibrous in appearance, in thin leaves, nearly transparent. "When in 

 a state of very fine subdivision it is entirely decomposed by sul- 

 phuric acid. 



Sp. Gr. 2-781. 



Silicic Acid 33-55 



Alumina 15-00 



Ferrous Oxide 10-78 



Magnesia 2973 



AVater (by difference) 10-94 



100-00 

 In one specimen the chlorite was associated with a ferriferous 

 dolomite in rhomboidal crystals. Its composition was as follows : — 



Sp. Gr. 2-935. 



Carbonate of Lime 5300 



„ Iron 8-16 



„ Magnesia 39-00 



100-16 

 Trace of Manganese. 



2nd. On the presence of Sulphide of Zinc in a crystalline car- 

 bonate from a trap dyke at Fairly, Ayrshire, Mr. Wiinsch drew the 

 attention of the author to some small brownish-black crystals 

 enclosed in a carbonate of iron, lime, and magnesia. On applying 

 suitable tests they were found to consist of sulphide of zinc and 

 some sulphide of iron. No carbonate of zinc was present. A por- 

 tion of the trap rock from the dyke itself was tested carefully for 

 zinc, but none was found. 



3rd. On a deposit from a Chalybeate water. Described as con- 

 sisting of hydrated ferric oxide, with a little clay and sand mechani- 

 cally intermixed. No lime was present. The water itself contained 

 carbonate of iron and sulphate of lime, but no carbonate of lime. 



4th. On Laumonite. 



5th. On some mineral cavities in trap rocks. The author ex- 

 hibited and described many specimens, showing the deposition of 

 quartz crystals on carbonate of lime ; also fluor spar and sulphate of 

 baryta, on quartz and carbonate of lime. 



C0I^I^:E:s:P02s^IDE!^sT•c:K!. 



YACHTING ON THE COAST OF NORWAY. 



Sir, — I am making preparations for a trip to Stavanger, Bergen, 

 and Trondhjun, starting after the middle of June. It has struck me 

 that, believing myself a fair observer, though a very ignorant 

 geologist, I might be of use to any more learned gentleman who 

 might wish any marks of coast elevation in modern times observed, 

 and also (being somewhat of a chemist) to mineralogists, so far as 

 the time and opportunity of so limited a trip wiU allow. I shall 



