iv Contents. 
PAGE 
Haemolysis by Sbetjm in Combination with certain Benzol 
Bodies. By T. J. Mackie 59 
On the Velocities of Two Distinct Gteoitps of Secondary 
Corpuscular Kays Produced by a Homogeneous Eontgen 
Radiation, and Their Absorption Coefficients in Various 
GrASES. By Lewis Simons, B. Sc. (Loud.). (With six text-figs.) . 73 
Some Notes on a Visit to Lake Fundusi in the Zoutpansberg 
District of the Transvaal, Paid in August, 1917. By T. 
Gr. Trevor, A.E.S.M., Inspector of Mines. Communicated by 
Dr. A. W. EoGERS. (With Plate III) 87 
Note on the So-called Second Branchial Arch in Lizards. 
By John Hewitt. (With one text-fig.) . . . . .91 
Note on Unimodular and other Persymmetric Determinants. 
By Sir Thomas Muir, LL.D 95 
Note on Certain Determinant Identities arrived at by H. v. 
Koch. By Sir Thomas Muir, LL.D 101 
South African Perisporiaceae : III. — Notes on Four Species 
OP Meliola Hitherto Unrecorded from South Africa. By 
Ethel M. Doidge. (With Plate IV) 107 
South African Perisporiaceae: IV. — New Species from the 
Coast Districts. By Ethel M. Doidge, M.A., D.Sc, F.L.S. 
(With Plates V and VI) . . , Ill 
Mycological Notes. — I. By Ethel M. Doidge .... 117 
Meliolastbr, a New Gtenus of the Microthyriaceae. By 
Ethel M. Doidge 121 
Some Controversial Notes on the Diamond. By J. R. Sutton, 
M.A., Sc.D., F.E.S.S.A., Hon. Memb. E. Met. S., Hon. Memb. 
S.A.S.C.E. (With one text-fig.) 125 
South African Perisporiaceae : V. — Notes on an Interesting 
Collection from Natal. By Ethel M. Doidge. (With 
Plates VII and VIII) 137 
Notes on the Shells op Schizodesma S'pengleri Linn. By 
J. D. F. Gilchrist, M.A., D.Sc, Ph.D 145 
An Extreme Case of Microcephaly. By E. Gr. Dru-Drury, M.D., 
B.S., D.P.H. (With Plates IX and X) . . . . 149 
A Contribution to the Study of the Diamond Macle, with a 
Note on the Internal Structure of Diamond. By J. E. 
Sutton, M.A., Sc.D., F.E.S.S.A., Hon. Memb. E. Met. S., Hon. 
Memb. S.A.S.C.E 153 
