SECTIONAL TRANSACTIONS.—K. 449 
Miss C. H. Lanc.—A _yeast-like fungus in the pollen and pollen-tubes of 
Camellia japonica (4.15). 
Pollen from a single variety of Camellia japonica obtained from Chelsea 
Physic Garden was germinated in sterile water. The protoplasm of the 
tube shows active streaming and is found to contain small bodies having the 
shape of dumb-bells or rods. These bodies may be clearly observed both 
in the grain itself and in the pollen tube. On two occasions a budding stage 
was observed in the pollen tubes. 
A number of varieties of Camellia japonica from various sources all show 
these bodies in the pollen grains and tubes. They are also distinguishable 
when the pollen is grown on agar media. 
When the pollen grains and tubes are ruptured, these bodies grow and 
then divide by fission into two. ‘The next stage observed in the development 
is the budding of the products of fission in the manner of a typical yeast. 
In pure water cultures of Camellia pollen and on agar, mycelia appear 
- which show typical budding. ‘The evidence seems clear that one of these 
forms is derived from the endophyte. It is intended to continue the 
investigation when further material is available. 
Saturday, September 7. 
Joint Excursion with Department K* (Forestry) to Breckland (10.0). 
Sunday, September 8. 
Excursion to Wroxham and Barton Broad (10.10). 
Monday, September 9. 
Mr. R. Bourne.—Aerial surveys (10.0). 
In the past, the majority of soil and vegetation studies have been based on 
localised observations. The significance of mapping over considerable areas 
has not been fully realised. Human actions have generally had a great 
influence on the phenomena to be observed and, without a record of past 
évents, observers have been frequently at fault in their attempts at a correla- 
tion of vegetation with local factors. ‘The independent mapping of site and 
vegetation over large areas enables comparisons to be made between different 
treatments on similar sites and the same treatment on distinct sites. In 
consequence, conclusions can often be safely drawn which would have been 
impossible had the investigations been localised. ‘The problem is to map 
large areas in any detail, and it is in this connection that aerial photography 
is primarily of value. Aerial photographs provide the most perfect form of 
map yet devised for recording detailed observations on the ground. If 
pieced together into mosaics, in order to furnish an air view of relatively 
large areas, they facilitate the delimitation of regions, the differences in 
landscape being presented in a manner impossible on any other form of map. 
These facts have been demonstrated by many workers in various parts of the 
world and the sole reason why air survey is not yet more generally employed 
is its initial cost. ‘The cost varies with circumstances, particularly the 
prevalent weather conditions, the scale of photography and the size of the 
area to be photographed. Hitherto, photography on scales smaller than 
