836 EEPOBT-1901. 



iieiglibourliood iuto callus, forming the callus rods. The subsequeut increase of 

 the callus to form the callus cushions is due to the activity of the protoplasm. 



10. lieport on Fertilisation in Phicophycecn. — See Reports, p. iiiS. 



11. lieport on the Morphology, Ecology, and Taxonomy 

 of the Podostemacece, — See Reports, p. 447. 



FRIDAY, SEPIEMBElt 13. 



The following Papers were read: — 



1. On Correlation in the Growth of Boots and Shoots. 

 By Professor L. Kny. 



The objections made to the author'.s former paper on the same subject ' by 

 Heering - are here criticised. If in his first paper he only gave the final result of 

 his experiments and not the detailed steps by which the first result was brought 

 about, he did so because the removal of the root or of the shoot from the seed- 

 lings must at first cause a shock to the organism and disturb its development, 

 quite independent of any correlation. This anticipation was shown to be true by 

 the careful studies of Townsend.'' 



Of the experiments which he made after the publication of his first paper he 

 quotes one with respect to cuttings of A)npelopsis qidnquefolia. From this 

 experiment it follows that, just as in the cuttings of Salix acuminata and 

 S. jmrpurea, the continual removal of the young shoots was soon followed by a 

 less vigorous development of roots, and vice versa. There is, however, this difi'ei'- 

 ence to be noted, that, whereas in 6'alix the retarding influence is to be detected 

 first in the roots, in Ampelopsis there are the shoots, which in this case proved 

 themselves to be more sensitive than the roots. 



The paper will be published in full in the ' Annals of Botany. 



2. The Bromes and their Brown Rust. By Prof. Marshall Ward, F.R.S. 



The author has been for some time occupied with the grasses of the genus 

 Bromus and the behaviour of the uredo of the brown rust {Puccinia digpersa) 

 upon them. The worii has entailed careful examination of the seeds and seedlings 

 of a large number of European and foreign Bromes and critical analyses of the 

 anatomical and morphological characters used in the systematic botany of the 

 group, 



The plan of the investigation includes the nature of infection and conditions 

 of attack, and all discoverable relations between host and parasite. 



The germination of the grass seeds has led to interesting points. They can be 

 treated autiseptically in various ways and grown as pure cultures in nutritive 

 solutions in glass tubes of various shapes, designed either to allow of the continuous 

 aeration of the plantlet by a current of filtered air drawn through by aspirators, or 

 not. 



Such pure cultures of the grass were then infected with uredo-spores. and in ten 

 to twelve days gave v\&&to pure cultures of tlie uredo, vfhich.gei:va.iriaX&A&nA infected 

 other similarly pure cultures of the grass inoculated with them. Control cultures 



' Ann. Bot., viii, 1894, p. 265. = Jahrb. f. m. Bot., ssix. 1896, p 132. 



" Ann. £ot.,:si. 1897, p. 609 ff. 



