326 Intelligence and Miscellaneous Articles. 



large boulders on their surfaces, occur in Aberdeenshire. Beneath 

 the gravel of these mounds, the author lias found beds of sand and 

 clay containing marine shells, generally broken, such ?LsNucula tenuis, 

 Leda pygmcca, Lucina ferruginosa, Cyprina Islandica, Mactra, Pec- 

 ten and Mangelia. 



At higher levels, to the elevation of 800 feet at least, Mr. Jamieson 

 has found striated pebbles and boulders, but unaccompanied by depo- 

 sits similar to the above. The last change of level in Aberdeenshire 

 seems to have been one of depression, indicated by beds of peat pass- 

 ing below the sea at various places between Aberdeen and the Morav 

 Firth. 



3. Mr. Kennedy Macnab, of Inverness, communicated, in a letter 

 to the Secretaries, the fact of flint arrow-heads and whelk-shells 

 having been found at the depth of about 3 ft. 6 in. beneath the sur- 

 face of a moss, covered with wood, in the parish of Abernethy 

 (Inverness and Elgin). 



4, iMr. Richard Mason, of Tenby, in a communication to the 

 Secretaries, offered a resume of the evidences, both traditionary, 

 historical, and physical, of — 1st, the probable depression at some 

 pre-historic period of an extensive tract of country, covering the site 

 of the Bristol Channel and Cardigan Bay ; and 2ndly, of the more 

 recent elevation of the land in the neighbourhood of Tenby, South 

 Wales ; the elevated district being apparently confined to that lying 

 on the carboniferous limestone. Evidence of a comparatively recent 

 depression of the Cardiff area was also alluded to. 



XLI. Intelligence and Miscellaneous Articles. 



ON FLUOKESCENCE PRODUCED EY THE AURORA. 



To John Tyndall, Esq. 



Observatorv, Armagli, 

 My dear Sir, March 24, 185«. 



I DO not know whether the fact mentioned in the enclosed has 

 been noticed before. If not, perhaps j'^ou may think it worth in- 

 serting in the Philosophical Magazine. 



V'ours ever, 



T. R. Robinson. 



On the 14th instant an aurora was visible here of more than the 

 average brightness. At 11 p.m. it showed an arch extending from 

 W. to N.E. by E., which emitted a few yellow streamers; and the 

 sky above it was covered with diffused light, over which brighter 

 portions flickered like waves, extending several degi'ees beyond the 

 zenith. I availed myself of the opportunity to try whether this light 

 was rich in those highly refrangible rays which produce fluorescence. 



