The Meeting of the British Association. 
1 73 
meeting of the Association were read. The most interesting of 
these was concerned with the Teaching of Botany in Schools 
(chairman, Professor Miall of Yorkshire College, Leeds). The 
Secretary to the Committee, Mr. Wager, gave an admirable sum¬ 
mary of the report, in which forcible expression was given to many of 
the modern ideas on the teaching of scientific subjects to children. 
The Committee on Botanical Photographs presented a report in 
which was embodied a scheme for the registration of photographic 
negatives of botanical interest, such as portraits of British or 
Foreign plants, photographs illustrating diseases or sports, and 
photographs shewing natural “ plant-associations.” A leaflet giving 
information on the conditions of registrations, etc., has already 
been widely circulated, and over fifty photographs, of which a 
considerable number are suitable for registration, have been 
received. Prints of negatives intended for registration should be sent 
to the Secretary of the Committee (Professor Weiss, The Owens 
College, Manchester). The object of the scheme is to draw up a 
list of registered negatives, so as to inform the students and workers 
to whom prints or lantern slides of such negatives would be useful 
of where they may be obtained. The copyright for purposes of 
publication would of course remain with the owner of the negative. 
The Committee recommends that negatives intended for registration 
should, where possible, be of whole or half plate size. This scheme 
of registration ought to give a stimulus to the systematic photo¬ 
graphy of our native plant-associations. 
At the conclusion of the morning, three papers on Fungi, in 
the absence of their authors, were read in abstract. 
In the afternoon Professor Letts of Belfast, who on more than 
one previous occasion has brought before the section the subject of 
the relation of the green seaweeds belonging to the family of 
Ulvaceae to sewage effluents, read a paper by himself and Mr. 
Totton in which he described the appearance of Ulva latissima on 
fragments of brick in the contact-beds used for the purification of 
Belfast sewage, and of Enteromorpha compressa in the effluent 
collected in a shallow lagoon. The high percentage of chlorine in 
this sewage supported the view that the algm obtained entrance to 
the sewage works by leakage of sea-water. The percentage of 
nitrogen in the tissue of both the algrn was considerably higher in 
these conditions than in samples taken from ordinary habitats, 
The rest of the afternoon was occupied by a paper by Miss M. 
C. Stopes on the Colonisation of a Dried River-bed, which is printed 
