NOTES AND COMMENTS. 
SEWAGE DISPOSAL. 
We have been favoured with a reprint of ‘ A Contribution 
to the Biology of Sewage Disposal,’ by J. W. Haigh Johnson, 
B.Sc., which appears in the Journal of Economic Brology, 
volume g, No. 4, pages 105-164. It deals fully with “ Histori- 
cal account of the development of the modern sewage (sprink- 
ler) filter’; ‘Organisms as an index of pollution’; ‘ Eco- 
logical associations and distribution of organisms in a sewage 
filter’; ‘Some noteworthy dominant organisms occurring on 
sewage filters (a) the Sewage or moth-fly (Psychoda) ; (6) 
the water springtail Podura, Achorutes viaticus (L.) Tulb. ; 
(c) other dominant or sub-dominant organisms.’ Even in this 
somewhat special subject it is interesting to find that Mr. 
3.—Eggs of Achorutes 
2.—Podura aquatica, show- viaticus (Linn.) Tulb., show- 
ing how the spring (s) projects ing separation of ruptured 
: . backwards beyond the body. outer integument and the 
1.—Group of insects (natural size). x 23. developing embryo. 
Johnson pays tribute to the researches of the late Dr. Sorby. 
The paper contains a fearsome list of the more characteristic 
organisms, arranged according to the pollution intensity, some 
of the illustrations of which we are able to reproduce. It is 
quite possible that his lists may contain additions to our 
county’s fauna. 
BOLLING HALL, BRADFORD. 
An inquiry was recently held at Bradford in reference to 
the application of the Bradford City Council for power to borrow 
£6,350 for the purchase of land adjoining Bolling Hall, and for 
the adaptation of that building for the purpose of a museum. 
The City Librarian pointed out that the new museum would 
contain views of old buildings and of old Bradford, portraits 
of local worthies, plans, manuscripts, and deeds relating to 
the city, a certain number of books, and a collection of relics, 
such as Chartist pikes and other arms, and old domestic and 
other articles of interest. The South Kensington Museum 
authorities have promised to lend the Corporation a collection 
1915 Mar. 1. F 
