160 British Association Meeting 
the seedling anatomy of the Sapotaceae. In the afternoon Dr Gelston 
Atkins will deal with seasonal changes in sea water and their relation 
to plankton, Prof. Seward with the Cretaceous flora of Greenland, 
Prof. Thoday with Passerina and its geographical distribution. At 
5 o’clock Dr W. L. Balls will give a popular lecture on Cotton. 
Tuesday morning will be mainly devoted to a joint discussion with 
Section M (Agriculture) on Virus Diseases of Plants. Dr Paul 
Murphy will open, and will be followed by the distinguished Dutch 
authority Prof. H. M. Quanjer, and then by Dr W. B. Brierley, 
Mr T. Whitehead, Mr Holmes Smith, Mr Kenneth Smith, and others. 
In the afternoon there will be an excursion to the West Lancashire 
sand dunes. 
Wednesday morning will be devoted to the Effect of Soil Sourness 
on Plants. The President will give a brief general account of the 
subject, designed for the orientation of members of the section to 
whom it is unfamiliar, and he will be followed by Dr E. J. Salisbury, 
Dr N. M. Comber, Dr W. H. Pearsall and Prof. J. H. Priestley. 
Different views of the essential factors at work will be put forward, 
and it is believed that an interesting and lively discussion will be 
secured. 
