47 
Laboratory Note 
tube C during the course of the experiment can be applied. The 
platform CME must be constructed so as to be as light as possible 
in order that no undue strain is made on the plant. It was found 
possible to construct a platform with a weight of 0*035 gm. which 
caused no injury to the plant. 
The order of the results obtainable by means of this apparatus is 
indicated by the accompanying graph. Obviously the apparatus can 
only be employed with plants similar to Impatiens where the lower 
end of C can be inserted in the axil of a leaf close to the growing point. 
A lamp, or other indicator, to show when the circuit is completed, 
can be substituted for the galvanometer, but the latter was found to 
give the best results. 
Thanks are due to Mr H. E. George of the Department of Physics, 
who has assisted in devising this apparatus. 
Hiatt Baker Laboratory, Department of Botany, 
University of Bristol. 
December, 1922. 
FORTHCOMING MEETING OF THE BRITISH 
ASSOCIATION, 1923, AT LIVERPOOL 
PROVISIONAL ARRANGEMENTS FOR SECTION K 
4 t the forthcoming meeting of the British Association for the 
Advancement of Science at Liverpool (September 12-19) the 
Botanical Section will be presided over by Mr A. G. Tansley, F.R.S. 
The programme promises to be an interesting one, and it is hoped 
to make it representative of the chief branches of Botany. In 
recent years joint discussions between two Sections have been a 
feature of these gatherings, and at Liverpool it is expected that a 
discussion on “Virus Diseases” will be arranged with either the 
Section of Physiology or Agriculture. Much important work of great 
biological interest has recently been done upon these strange maladies, 
and a stock-taking of present views upon them is considered to be 
opportune. Plant physiology will again occupy a prominent place in 
the programme, and contributions have already been promised by 
Dr F. F. Blackman and by Prof. V. H. Blackman. The latter will 
