Fungi found in polluted West Riding Streams, eic. 405 
these occur in waters containing some form of sulphur. The 
filaments are regularly septate, but the sulphur deposit obscures 
the division walls giving the appearance of a nonseptate 
organism. BB. alba occasions the white deposit seen in sulphur 
springs, and B. leptomitiformis forms the delicate white film 
sometimes found on decomposing mud. 
The members of the group Rhodobacteriacee often contain 
sulphur, but are distinguished from the Beggiatoacee by 
possessing a red colouring matter (bacteriopurpurin), and by 
not being filamentous. Chromatium Okenti is the best known 
member, which in appearance greatly resembles a red flagellate, 
and may occur in such quantity as to give a distinct red colour 
to the liquid. 
The fungi of the higher groups usually occur in less polluted 
waters, and are more frequent in running streams; but, as 
found, they are generally indeterminable. Subculture on suit- 
able media is therefore necessary to reveal their identity. The 
subcultures are usually made in glass (Petri) dishes on solid 
media, and by this means the following species have been 
isolated :—Mucor tenuis? Thamnidium elegans, Saprolegnia 
sp.? Leptomitus lacteus, Oospora lactis, Oospora (Monalia) 
variabilis, + Aspergillus griseus, *Acremonium spicatum, *Sporo- 
trichum lanatum, Botrytis vulgaris, B. fascicularis, Fusarium 
solani, 
—_____—_9.@——__ 
Round the Year with Nature, by W. J. Claxton (London: G. Routledge 
and Sons. 302 pp., 7/6 net), deals fully with tie various aspects of animal 
and plant life month by month ; and is evidently intended for younger 
readers. It begins in September, and there are chapters on ‘Seed For- 
mation and Dispersal,’ ‘ The Woodlands,’ ‘ Fruits,’ ‘The Partridge and 
Grouse.’ Under October we find ‘The Rose Family,’ ‘ Fruits of the 
Hedgerow,’ Nuts, Pheasant, Hare, and others, and a ‘Ramble on the 
Moor,’ and so on. Most of the information is gathered from rambles in 
the south of England. The book is unusually well illustrated, there being 
over 200 blocks from photographs in the text, and 24 coloured plates 
from paintings by Maude U. Clarke, which are really admirable ; the ; 
view of the Fungi on the Moor (facing p. 48), being perfect. 
Mr. Claxton has also issued another volume, Methodical Nature Study 
(Blackie & Sons, Ltd 195 pp.). 
This work also deals with the various aspects of Nature, month by 
month, and the fact that part of the volume is reprinted from The Teachers’ 
Aid shews that the writer had the teachers’ needs in his mind when pre- 
paring his notes. The fact is further shewn as the author has endeavoured 
to correlate the Nature Study with drawing. Here, again, the author 
begins with September, in which month he deals with the woods, seed 
formation and dispersal, hips and haws; in october we have * Fruits’ 
the Partridge and Pheasant, Nut-bearing trees, leaf coloration,’ in fact, 
throughout there is a similarity in this and the volume already referred to. 
Methodical Nature Study, however, is more for the teacher, whereas Round 
the Year with Nature is more for the scholars. 
a 
* New to Britain. 
+ Probably all such records are synonymous with 4. fumigatus. 
1911 Dec. 1. 
