226 REPORT—1905. 
use has saved the physiological errors introduced by defibrination of the 
blood of the animal, whilst for blood-gas analysis it has proved entirely 
reliable. 
It has been found possible to get a satisfactory record of the blood- 
flow through an organ in two ways :— 
(a) By causing blood to flow along a recurrent vessel into a tube con- 
nected with a bellows recorder, and subsequently returning the blood to 
the vein from which it came. 
(6) By momentarily obstructing the flow through the vein when the 
organ is in a plethysmograph. 
A modification of Bohr’s blood-gas receiver | has been introduced with 
a double-surface condenser, packed with a freezing mixture. This form 
of receiver has proved very satisfactory. 
Botanical Photographs.—Report of the Committee, consisting of Pro- 
fessor L. C. Mrauu (Chairman), Professor I’. E. Werss (Secretary), 
Mr. Francis Darwin, Mr. W. G. Suiru, and Mr. A. G. TANsLey, 
for the Registration of Negatives of Photographs of Botanical 
Interest. 
Forry photographs have been added to the register since the last meet- 
ing. They have been received from various persons, but we would men- 
tion in particular a series of photographs by Mr. R. Welch illustrating 
the coast flora of Ireland, and a number of photographs by Professor 
Yapp, of Aberystwyth, illustrating some aspects of the vegetation of the 
Malay Peninsula. 
A printed list has been prepared of the photographs so far contributed 
to the register, and this will be ready for circulation in July. 
The recently established Committee for the Botanical Survey of Great 
Britain contemplates the establishment of a collection of botanical photo- 
graphs of British vegetation, and it is hoped that that committee will 
collaborate with the Committee of the British Association by taking over 
the work of collecting and arranging photographs relating to British 
vegetation. 
Of the grant of 5/. mide to the Committee 3/. 17s. has been spent on 
printing the register, as decided upon last year. 
Feperimental Studies in the Physioloay of Heredity.—Second Report 
of the Committee, consisting of Professor H. MarsHatn Warp 
(Chairman), Mr. A. C. Sewarp (Secretary), Professor J. B. 
Farmer, and Dr. D. Swarr. 5 
Report to the Committee by W. Bateson, M.A., F.R.S. 
Experiments on heredity in plants and animals have been continued 
throughout the year. 
In Primula sinensis the inheritance of the three types of flower, long- 
1 Made by Messrs. C. E. Muller, Orme & Co. 
