394* Scientific Intelligence — Geology. 



necessity of cleaning wool before dyeing it. The wool which 

 has lost its fat matter, contains the sulphur which is remarked 

 in wool in its original state ; and both kinds, on being treated 

 with alum and tartar, disengage hydro-sulphuric acid. It is to 

 the sulphur contained in wool that the phenomena of coloration 

 are to be attributed which it presents, when it is heated in a so- 

 lution of acetate of lead, of acetate of alumina holding acetate 

 of lead, protochloride of tin, &c. 



MINERALOGY. 



3. Discovery of Emerald-green and deep Violet-blue Fluor- 

 spar in Baiiffshire. — In 1823, Mr G. C. Smith, land-surveyor, 

 Banff, while surveying part of the Duke of Gordon's property 

 in the upper district of Banffshire, found fragments of deep 

 emerald-green and deep violet-blue fluor-spar lying in the bed 

 of the river Avon above Tomintoul. He traced it up the north- 

 west side of the river to Gaulrig, about half-way between To- 

 mintoul and Inchrory, where he found a considerable quantity 

 of loose pieces. The fluor-spar seems to have been detached by 

 the water from some limestone beds lying in the mica-slate 

 of that district. Of this new locality of a rare Scottish mineral, 

 we hope soon to be able to give a more particular description. 

 Calc-tuff, with beautiful impressions of leaves, was found at the 

 same time by Mr Smith, in a large mass close upon Inchrory. 



GEOLOGY. 



4. Organic Remains in Sussex. — Mr Gideon Mantell, 

 F. R. S. of Lewes, in Sussex, has laid before the Geological So- 

 ciety of London, a catalogue of the organic remains discovered 

 by him in that county. The strata of Sussex are comprehend- 

 ed in two principal groups, the first or uppermost of which 

 contains marine deposites, viz. the Chalk, Gait or Shanklin sand; 

 the second, or lowermost formation, is fresh water, and comprises 

 the Hastings strata, with their subordinate divisions, the Weald 

 clay, Tilgate Grit, and Ashburnham limestones. 'J^he orga- 

 nic remains are distributed in these formations as follows : 



