Notices of Memoirs — Short Notices of Scientific Papers. 367 



analogy between them. But in the Polyfant rock felspar, whether 

 kaolinized or not, seems to be entirely absent, and this forms a 

 notable distinction. Moreover, a great deal of the serpentinous 

 matter certainly does not resemble highly altered olivine ; so that, 

 if there be any rock properly to be classed with the picrites in 

 Cornwall, this is it. It must, too, be admitted that the Duporth rock 

 has a good deal of superficial resemblance to it, although it was 

 originally so very different. The Polyfant stone is quite soft — 

 except for the occurrence of occasional hard grains of pyritous or 

 siliceous matter — so that it can be readily cut with a chisel or even 

 with a pocket-knife. Sound fragments have been formed into 

 crucibles and used for melting tin and copper for small castings. It 

 appears to be well adapted for this purpose, although I am unable 

 to say that it has advantage over the ordinary " black-lead " pots. 



ISTOTIOES OIF" IMIIEIMIOIIRS- 



I. — Short Notices of Scientific Papers. 



1. — Iattagelser ofver qvartara bildningar pa Gotland. Af Henrik 

 Munthe. Geol. Foreningens i Stockholm Forhandlingar. No. 100. 

 Bd. viii. H. 2. 



2. — Om postglaciala sankningar af Gotland. Af. G. Lindstrom. 

 id. No. 102, Bd. viii. H. 4. 



THE first of these papers contains many interesting facts respect- 

 ing the Glacial and Post-Glacial phenomena of the isle of 

 Gotland. Two systems of Glacial striae have been noted, one, best 

 developed in the north and north-west, has a main direction from 

 N.W. to S.E., and the other, extending over the rest of the island, 

 runs from N.E. to S.W. Eaised beaches are traced at various eleva- 

 tions up to 78-5 m. or 259 feet above the sea-level, the highest point 

 on the island. A description is given of a remarkable As or Kame 

 near Visby, which rests on Boulder-clay, and is partially covered by 

 it. The erratic boulders are traced from the Aland isles, Angerman- 

 land ; possibly from the South-west of Finland, and from the bed of 

 the Baltic. Two maps are appended ; one showing the direction of 

 the striae and the contour-lines of the island, and the other of the 

 district round Visby. 



In the second paper, Prof. Lindstrom gives a description of sections 

 lately exposed at Hafdhem in Gotland, in which turf deposits, 

 nearly 50 feet above the sea-level, containing 28 species of existing 

 freshwater mollusca, are overlaid by a marine sand with littoral shells. 

 The author points out certain facts in the configuration and structure 

 of the rock terraces in Gotland which indicate that the island received 

 its present form by denudation, previous to the Glacial Period, and 

 that various changes of level have taken place since that time. 



3. — Om Kambriska pyramidalstenar. Af A. G. Nathorst. Ofversigt 

 af Kongl. Vetens.-Akad. Forhandl. 1885. No. 10. 



4. — Sur les causes de la production de facettes sur les quartzites 



