LINNBAN SOCIETY OF LONDON, 



December 1st, 1921. 



Dr. A. Smith AVoobward, F.Il.S., President, 

 in the Chair. 



The jMinutes ot' tlie General Meeting of the ITtli jVoveniber, 

 1921, were read and confinned. 



The report of the Donations received since the last Meeting was 

 laid before the Fellows, and the thanks of the Society to the 

 several Donors were ordered. 



Certiiicates for the following were read for the second time : — 

 Norman Douglas Simpson, B. A. (Cantab.), and Douglas Miller 

 Eeid. 



Mrs. Alice Sophia Bacon, B.Sc.(Lond.), was proposed as a 

 Fellow. 



The President gave notice of a proposed change in the Bje-Laws, 

 enlarging tlie permissible number of Fellows from 710 to 800. 



It was also announced from theCliair that a Dinner would take 

 place after the meeting of the Society on 19th January, 1922. 



The first communication was by Prof. W. IVeilson Jones, 

 M.A., entitled "Notes on the Occurrence of BracJiiomonas '' (see 

 Abstract, pp. 57-59). 



Sir N. Yerinoloff, K.C.B., Dr. E. J. Salisbury, Dr. W. T. 

 Caiman, and Mr. H. N. Dixon contributed further remarks, and 

 the author briefly replied. 



Mr. J. Burtt-Dayy then gave an account of the distribution 

 of Saliv in South Africa. He remarked that confusion of species 

 iu this region was partly due to tlie dimorpliism of the leaves, 

 those of young shoots being often quite different from the adult 

 leaves. We can recognise in South Africa ten possible species or 

 varieties, and iu tropical Africa twelve named species, only one 

 being common to both areas, a form characteristic of the Limpopo 

 Biver basin, but not crossing the Zambezi ; the other nine are 

 strictly endemic, mostly in very limited areas, so that cross- 

 pollination is practically impossible. Usually each species is 

 confined to one particular drainage-basin ; where more than one 

 species is found in the same basin, it is due to erosion, the streams 

 being formerly united. Thus the distribution of S. Woodii 

 and ^. fjarii'inna suggest a coast origin and subsequent ascent to 

 the mountains following the erosion of the streams; had it 

 originated on the Drakensberg, the two could hardly have failed 

 to reach the same drainage-basin, as they now occur only fifty 

 miles apart. S. Woodii may be the connecting-link by ^ay of 



