156 REVIEWS.—POST-TERTIARY DEPOSITS, ETC. 
Clay, which he believes to be the lowest glacial deposit present. The 
gravels and sands which occur sometimes in, sometimes below this great 
clayey deposit, he regards as local only, and not forming part of the 
Middle Glacial Sands of Mr. Searles V. Wood, jun. As to the mode*of its 
formation, Mr. Jukes-Browne considers that the Chalky Boulder Clay 
was formed by matter dropped from bergs and coast-ice in a sea open to 
the north, but with land to the south and west. When this area was 
again elevated, the coarse hill gravels (with what are called the 
“ Plateaux ” and “ Flood” gravels) were formed on the highest points as 
they rose above the sea by the action of currents on the boulder clay. 
The elevation increasing, rivers would begin to flow over the new land 
surface, and from their action the several series of river gravels would 
result. Altogether this essay is a valuable contribution to the geology of 
the district to which it relates. The author is upon the staff of the 
Geological Survey, and we shall look forward with interest to further 
accounts from his pen describing in other districts the deposits of which 
he has given us so good an account in Cambridgeshire. 
W. J. 4H. 
Proceedings of the Chester Society of Natural Science. No. II. Chester: 
Printed for the Society. Price 2s. 6d. 
Tuts Society is evidently doing good work, and the pamphlet which has 
just been issued does the members very great credit. It contains a 
number of thoughtfully and ably written papers on the geology and the 
fauna and flora of the Chester district, and is illustrated by an 
autographic print, taken from a photograph, of a specimen of Stigmaria, 
from the coal measures of Trefnant, near Ruabon. Mr. A. O. Walker, 
F.L.S., contributes two very interesting papers, viz., ‘‘ Observations on 
Phenomena connected with the Deposition of Sediment at the present 
day in the Estuary of the Dee, and their bearing upon Older Deposits ;” 
and ‘ Notes on the Lower Coal Measures between Bagillt and Holywell.” 
Mr. George W. Shrubsole, F.G.S., contributes a paper ‘ On the Origin of 
Rock Salt,” in which he contends that ‘‘ rock salt has been derived from 
the evaporation of water.” Mr. W. Shone, F.G.S., supplies a valuable 
paper on “‘ The Drift Deposits of West Cheshire,” with the lists of the 
foraminifera, ostracoda, mollusca, polyzoa,  cirripedia, annelida, 
echinoidea, and spongida, found by himself and other members of this 
society. Dr. H. Stolterfoth, M.A., contributes an excellent ‘‘ List of the 
Diatomacez found in Chester and district and Cwm Bychan, N.W.” In 
this list are some very rare species. There is a very able paper by Mr. 
J. D. Siddall **‘ On the Foraminifera of the River Dee,” giving descrip- 
tions of several species new to the British fauna which have been found 
in this river ; together with extensive lists of the species found by him, 
many of them very rare. Mr. T. Shepheard gives an excellent account 
of the ‘‘ Freshwater Polyzoa found in the neighbourhood of Chester,” with 
descriptions and notes. There is also a lengthy communication by Mr. 
J. Price, M.A., on ‘‘ Proliferous Leaves and Notes thereon,” being an 
account of some original investigations made by him on Cardamine 
pratensis. Mr. Price finds that every leaflet of this plant will germinate 
and give origin to a new plant. This paper is worthy of the attention of 
all botanists. Mr. H. J. Baillie contributes ‘‘ The City Flora,” and gives 
a list of over 400 flowering plants and ferns found within the “ city of the 
county of Chester.” These proceedings are well printed, and free from 
typographical errors. 
J. E. B. 
