</// and Natural History. 321 



5. Diatom beds and bogs of the Yellowstone National Park. 

 — Mr, W. II. Weed, in :i paper in the Botanioal Gazette, vol. 



\i\, states that Diatom beds cover many square miles in the 

 vicinity of active and extinct hot--])] 'mil;- vents, and vary from 

 three to six- feet in depth. The wagon road leading to the 



pser basins crosses several meadows of this character. Near 

 the Emerald spring, at the Upper Geyser basin of Pirehole 

 River, there is a typical marsh of this kind, whose waters 

 encroaching either side, have killed the pines. The Larger part of 

 the bog was sparsely covered by brackish water plants, while the 

 drier parts are growing grass. The material in the bog is chiefly 



semi-liquid, greenish gray, dirty-looking ooze, consisting, as 

 detected under the microscope, of the shells of Diatoms of the 

 following species, as determined by Mr. F. Wolle : Denticulo 

 vcUida (the most abundant), D. eleyans, NavicUla major, N. 



idis, Epithemia argue, E. Hyndmannii, Cocconema eymbifor- 



. Achnanthes gibberula, Mastigloia Smithii, a Fragillaria, 

 D. oalida, it is stated, occurs also at the geyser basins of Iceland. 

 hasan limestone and other rocks in Norfolk, Connecti- 

 cut. — A large region between Winsted and Norfolk, in the 

 western half of northern Connecticut, numbered K2 in Percival's 

 Report on the Geology of the State, has been supposed to be 

 Arclnean. This was the opinion of the writer after his study of 

 the region some years since. In 1885 Mr. R. H. Cornish, then 

 residing at Norfolk, gave the conclusion a better foundation by 

 the discovery of limestone which had characteristic Archsean 

 features. The village of Norfolk is ten miles to the east of 

 Canaan where the rocks are the limestone and schists of the 

 Taconic system. Mr. Cornish states that the limestone ledge is 

 on the land of Mr. Ralph Crissy, near a spring southeast of his 

 house, associated with hard gneiss, granite and some hornblendic 

 rocks, which have in general a high eastward dip; and that it 

 afforded him octahedrons of spinel (some of them half an inch 

 across), together with a little chondrodite. The outcrop is only 

 75 yards long and 20 wide; and it was difficult to determine its 

 stratigraphic relations to the associated rocks. Apparently it was 

 not conformable to them ; but more study is needed for a deci- 

 sion. In a ledge crossing Crissy Hill there is much magnetite ; 

 and two and one-half miles east of Norfolk, at the foot of Pine 

 Mountain, and near the cross road leading from the Winsted 

 turnpike to Grants, a large vein has been opened and was for a 

 time worked. J. d. d. 



7. Glacial scratches in the vicinity of Norfolk, Conn. — Mr. 

 R. H. Cornish obtained for the direction of glacial scratches on 

 Dutton Hill, 1640 feet high above tide level, S. 28° E., the same 

 as on Mt. Everett, 20 miles to the west, which is 1,000 feet 

 higher. The directions in the region, in 25 to 30 observations, 

 varied from S. 24° E. to 8. 48° E. ; the mean, S. 33° E. 



8. On some Mammalian Remains of Florida and elsewhere; 

 by J. Leidy. Trans. Wagner Free Institute of Science, Philadel- 



