336 NATURAL SCIENCE. May, 1893. 
Mr. Matcotm Laurie deals in the current part (vol. xxxviul., 
pt. i.) of the Edinburgh Royal Society’s Tvansactions with some new 
forms of Eurypterid remains from the Upper Silurian Rocks of the 
Pentland Hills. So rich was a particular seam of fine-grained sand- 
stone in these extinct ‘“‘ Sea Scorpions,” that no less than five new 
species, including anew genus (Drepanopterus), were found. An 
interesting feature of these species was the large size of their eyes, 
and the author hints at a possible deep-sea habitat. It is known 
that many deep-sea creatures, particularly among Crustaceans, are 
endowed with abnormally large eyes, “as if to make the utmost 
possible use of the failing light,” which (according to one naturalist, 
at least) does reach even the deepest abysses of the ocean. 
Tue Transactions of the London Meeting of the International 
Congress of Hygiene and Demography, held in 1891, have just been 
issued in the shape of thirteen volumes. These include numerous 
papers on Bacteriology and other subjects of interest to students of 
Natural Science. 
In a letter to M. Daubrée, recently read to the Academy of 
Sciences, Baron Nordenskjéld has called attention to the wide distri- 
bution of certain metals hitherto regarded as rare. His analyses ot 
the ash of an anthracitic substance occurring in large nodules in the 
old rocks near the iron mines of Norberg and Dannemora, in Sweden, 
showed the presence of the oxides of nickel and uranium (the latter 
to the extent of 3 per cent.), and the rare earths of cerite and 
gadolinite. 
Tue committee of the Alpine Club are taking steps, at the sugges- 
tion of one of their members, Captain Marshall Hall, to collect infor- 
mation from colonies and other countries as to glacier motion and 
history. Such of our readers as are about to visit glacial districts 
can much assist. Photographs are especially desirable, of shrinkage 
or increase, and of other changes, and evidence as to any part taken by 
ice-action in lake formation. They will find an article upon rough 
surveying and cognate subjects in the Alpine Fourvnal for February, 
1891, written by the above-named gentleman, who has consented to 
deal with the materials which it is hoped will result from the action 
of the committee. 
Tue Geologists’ Association has planned to visit Bath at Whit- 
suntide. Excursions are arranged to see the Fuller’s Earth works at 
Midford ; the Forest Marble, Bradford Clay, and Great Oolite, at 
Bradford-on-Avon; and the Corallian Beds and Iron works at 
Westbury, in Wiltshire. It is also expected that one day will be 
devoted to the classic region of Dundry Hill. 
