Minutes of Proceedings. 
XXI 
EiBT CoPEMAN and Mr. W. J. CoPENHAaEN were elected Members of the 
Society. 
Dr. M. E. Drbnnan, proposed by Dr. J. D. F. Gilchrist, seconded by 
the Hon. Secretary, and — 
Dr. CoRNELis PijPBR, proposed by Miss M. Wilman, seconded by 
Mr. J. R. Sutton, were nominated for membership. 
Sir A. Thbiler and Dr. J. Moir were received as Fellows. 
Communications : 
" Luminosity in a South African Earthworm and its Origin." By 
J. D. F. GrlLCHRIST. 
Luminous earthworms are found on the slopes of Table Mountain. The 
luminosity proceeds from a discharge from the mouth and anus which 
consists of cells heavily laden with inclusions of different kinds. The 
smaller inclusions consist of a substance allied to fat, by the oxidation of 
which the light is produced. The cells arise from the body-cavity and are 
discharged into the anterior and posterior parts of the alimentary canal by 
definite communications between the coelom and alimentary tract. 
"Note on the Adjugate of Bezout's Eliminant of Two Binary Quantics." 
By Sir Thomas Muir. 
" On the Genera Diplocystis and Broomeiay By L B. Pole-Evans and 
AVERIL M. BOTTOMLEY. 
Some specimens of Diplocystis have recently been obtained by the authors 
from Portuguese East Africa, and this is the first recorded occurrence of this 
interesting genus from Africa. The African material is not identical with 
that from Cuba, and the authors describe it as Diplocystis junodii nov. spec. 
" South African Perisporiaceae. II : Eevisional Notes." By Ethel M. 
DOIDGE. 
This communication consists of a revision, due to work on a number of 
fresh collections of South African Perisporiaceae, of a previous communication 
on the subject by the author. 
"Fresh-water Snails as a Cause of Parasitic Diseases." By F, G. Cawston. 
The author describes a number of snails collected by him from various 
districts in South Africa, and found to be infested with the cercarial stages 
of the various trematode worms. 
" Colour and Chemical Constitution. Part IV : The Eemaining Phtha- 
leins." By Jambs Moir. 
The absorption-spectra of complex phthaleins are described, these being 
partly duplex compounds of the phenol-anthrol type and partly of a new 
class {e.g. thymol-naphthol) derived from thymoylbeuzoic acid. The additive 
nature of the effects of different substitutions is emphasised by means of a 
table giving the numerical values of the change of wave-length for different 
substituting groups. 
