Obituanj — Profeawr Dr. Geinitz. 143 



terms are generally pretty expressive. In solid rocks water often 

 issues from joints. 



We went on to Londoun Hill. This hill is not named on Sheet 23 ; 

 it is just above the house named Backhill on the western edge of 

 the map. It is composed of large vertical columnar felstone. 



To the east and south-east of this hill the ' Survey ' have shown 

 a ' terrace of marine drift ' and an ' old sea beach.' Lately 

 I observed that the talus of large blocks from the hill had fallen 

 doicn upon the top of the ' marine drift/ so that the great vertical cliff 

 on the south side of the hill was ver^' likely the ivork of the loaves, 

 assisted perhaps by shore-ice, for much of the ' felstone ' in the drift 

 may have come from this hill, it being the only felstone rock within 

 many miles of this district. 



The ' marine terrace ' is 700 feet, and the top of Londoun Hill 

 1,034 feet, above sea-level. 



The facts given in this letter speak, I think, pretty plainly. The 

 Drift beds here are clearly loater deposits, and that ' water ' was the 

 sea. The blocks and stones in both the stony and laminated clay 

 were clearly dropped into the clay from floating ice. In bed 2 (the 

 stony Boulder-clay), there are frequent indications of stratification, 

 and those lines have a steady, gentle dip of five to ten degrees 

 towards the east, or up the Irvine Valley. This long section has 

 been exposed to the weather for about six months ; the clay has 

 not slipped, and the rain-washed face of the drift can be read like 

 a book. There are many well-striated stones and boulders lying in 

 all directions, long ones even vertical, but quite as many which show 

 no striations. The ruts in the stony clay bed 2 were probably 

 produced by floating ice grating on the sea bottom, and these have 

 formed sheltered holloios in which laminated clay has been deposited. 



J. Smith. 



MONKREDDING, KlLWINNING. 



SOME SNOWDON TARNS. 

 Sir, — Will you permit me to correct a mistake in my paper on 

 " Some Snowdon Tarns." The depression at 250 yards from the 

 present outlet of Llyn Llydaw is in a N.N.E. direction therefrom, 

 not N.N.W. as I had erroneously written. J. R. Dakyns. 



Snowdon View, Nant Gwynant, 

 Beddgelert, Carnarvon. 

 February 19, 1900. 



OBiaruj^iKiir. 



GEHEIMRATH PROFESSOR DR. GEINITZ, 



For. Mem. Geol. Soc. Lond. 

 Born October 16, 1814. Died January 28, 1900. 



Dr. Hans Bruno Geinitz was born at Altenburg, Saxony, where 

 he passed a happy boyhood in his father's home. The political 

 troubles of 1830 affected the family prosperity, so that the youthful 



