383 
1906-7.] Meetings of the Society. 
Lepidosiren paradoxa. The papers are a model of careful description, and 
are profusely illustrated by accurate drawings and microphotographs. The 
work is of a laborious description, and bears upon the face of it the stamp 
of accuracy. The part which deals with the origin of the leucocytes is of 
great interest, both practical and theoretical, and it may be truly said that 
Dr Bryce’s observations have thrown a considerable amount of light upon 
a very intricate subject. Nor is the account which he has given of the 
development and structure of the erythrocyte of less importance. The 
description of the mitotic changes of the dividing erythrocyte has an 
intimate relationship to similar changes which occur in other somatic cells, 
and the author has been able to clear up more than one obscure point in 
connection with this subject, and in connection with cell-structure in 
general. He has also succeeded in demonstrating in an objective 
manner, by sections through the erythrocytes, that the fibrillar structure 
which was originally described by Meves, encircling the Amphibian 
erythrocyte, is not merely the optical expression of folds in the cell- 
membrane, but that the appearance is due to the presence of actual fibrils 
within the border of the corpuscle ; and as a result of Dr Bryce’s work this 
interpretation of the appearances is now universally accepted. 
The Makdougall-Brisbane Prize for the biennial period 1904-1906, 
awarded by the Council to Jacob E. Halm, Ph.D., for his two papers on 
“ Spectroscopic Observations of the Rotation of the Sun,” and “ Some 
Further Results obtained with the Spectroheliometer,” and for other 
astronomical and mathematical papers published in the Transactions 
and Proceedings of the Society within the period, was handed by 
the Chairman to Professor Dyson, for transmission to Dr Halm, now in 
Cape Town. 
The Chairman, in presenting the Prize, read the following statement 
explaining the grounds of the award : — 
Dr Halm’s researches on the rotation of the sun are an important 
contribution to the study of its mechanical condition. From observations 
of Sun Spots in the years 1851-1863 Carrington showed that the sun did 
not rotate as a rigid body, but that the angular velocity in different 
latitudes diminished from the Equator to latitudes 35 N. and S., the limits 
of the Sun Spot zone. As, owing to the rotation of the sun, the eastern 
limb advances and the western limb recedes from the earth, the lines of 
the spectrum at points on the sun’s limb are displaced slightly from the 
normal positions they occupy in the spectrum of the sun’s centre. The 
