BOtANiCAL SOCIETY OF EDINBURGH XXXlll 



Miss Elsie Cadman exhibited specimens of Actinomyces 

 Scabies, the cause of common Potato Scab, and gave some 

 account of the disease. 



The following plants in flower were shown from the Royal 

 Botanic Garden : — Lathraea clandestina, Linn. ; Rhododendron 

 acuminatum, Hook. f. ; R. argenteum. Hook. f. ; R. barbatum, 

 Wall. ; R. irroratum, Franch. ; R. moupinense, Franch. ; 

 R. nobleanum {arboreumxcaucasicum) ; R. nobleanum album 

 {arboreum album x caucasicum) ; and R. praecox {dahuricum x 

 ciliatum). 



MARCH 15, 1923. 



Professor W. Weight Smith, M.A., F.L.S., F.R.S.E., Prcaideut, 

 ill the Chair. 



Mr. John H. Gray was elected a Resident Fellow. 



Mr. Ernest V. Laing read a paper on Mycorhiza and Tree 

 Growth in Peat, which he illustrated by lantern slides. 



Dr. R. J. D. Graham exhibited specimens of Crocus vernus 

 showing pull roots. 



A portrait of Linnaeus engraved from a copy of Hoffman's 

 painting was exhibited. 



The following plants in flower were shown from the Royal 

 Botanic Garden : — Aerides vandarum, Reichb. f. ; Vanda 

 teres, Lindl. and Aerio-vanda Mundayi, Hort. Edin., a hybrid 

 between Aerides vandarum and Vanda teres ; Primula Allioni, 

 Loisel. ; P. darialica, Rupr. ; P. Fortunei, Vatke ; P.frondosa, 

 Janka ; P. obconica alba ; P. philoresia, Balf. f . ; Saxifraga 

 Boydii, Hort. Dewar ; S. Burseriaiia, var. ; S. Irvingi, Hort. ; 

 S. latina, Hayek ; S. Rudolphiana, Reichb. f. ; and Soldanella 

 pusilla, Baumg. 



APRIL 19, 1923. 



Professor W. Wright Smith, M.A., F.L.S., F.R.S.E., President, 

 ill the Chair. 



Col. H. H. Johnston read a paper, Additions to the Flora 

 of Orkney as recorded in AVatson's Topographical Botany, 

 2nd ed., 1883 (see p. 174), and exhibited a number of interesting 

 illustrative specimens collected by himself. 



Dr. J. M. Dalziel exhibited specimens of Barteria nigritana, 

 a Nigerian Myrmecophyte. 



