The British Association in South Africa. 209 
lines of nuclear evolution, leading respectively to the central body 
of the Cyanophyceae, and the nuclear apparatus of the yeast plant.” 
But between these groups on the one hand, and the Algae and true 
Fungi on the other, so far as the nucleus is concerned, “there are 
gaps which we cannot bridge at present.” 
It is impossible, in a short sketch, to deal in any way adequately 
with the many points of interest raised by Mr. Wager in the course 
of his admirable address : but this is the less necessary as the 
address itself has already been printed in Nature (September 21st)* 
Mr. A. C. Seward gave an interesting account of the Fossil 
Floras of South Africa. He drew attention to the fact that our 
knowledge of these floras is still incomplete, and pointed out that 
collectors may do much to remedy this defect. 
Mr. T. R. Sim also read a paper on the distribution of South 
African Ferns. 
Wednesday was a full day, as it had been decided to take the 
papers originally arranged for Friday morning on that day, in order 
to leave Friday free for a special excursion to the Magaliesberg. 
In the morning, Professor F. E. Weiss, in presenting the 
report of the Committee for the Registration of Photographs of 
Botanical Interest, contributed a paper on the value of Botanical 
Photographs. The paper was illustrated by a fine series of lantern 
slides, which strikingly exemplified the value of such photographs 
for teaching and other purposes. Professor Weiss pointed out that 
photography can be usefully employed in such studies as geographical 
distribution, morphological and pathological botany, and even for 
cryptogamic work. 
The Committee referred to above has already established a fair 
collection of photographs, but is anxious to receive further help 
from scientific photographers in all parts of the world. In addition 
to this collection, the recently formed Committee for the survey 
and study of British Vegetation, has decided to collect a series of 
ecological photographs illustrating British plant-associations. 
Mr. J. Burtt-Davy discussed the climate and life-zones of the 
Transvaal. According to altitude and climate three more or less 
well-defined zones can be distinguished: (i.) The Low Veld, 
600-ft.-1500-ft., a dry, tropical, well-wooded region: (ii.) The High 
Veld, 4000-ft.-6000-ft., a treeless, grassy plateau: (iii.) The Middle 
Veld, l500-ft.-4000-ft., intermediate between the other two. It is 
covered for the most part with Acacia “bush” and low trees, with 
intervening open grassy places. Each of these zones is charac- 
