CONTENTS. 
The Torsion Problem for Bodies of Eevolufeion, By E. T. Stegmann. 
(With Plates A, B, VIII-X^7III) . . . . . . 147 
Note on the Structure of the Genital Organs of a True Herma- 
phrodite. By H. V. Exnee, M. A. .... . . 181 
Colour and Chemical Constitution. Part IV. — ^The Bemaining 
Phthaleins. By James Moir, M.A., P.Sc, P.I.C. . . . 183 
On the Genera Diplocystis and Broomeia. By I. B. Pole Evans, 
M.A., D.Sc., F.L.S., and Averil M. Bottomley, B.A. (With 
Plates XIX-XXIII) . . . , \ . . . .189 
South African Perisporiacese. II. — Eevisional Notes. By Ethel M. 
DoiDGE, M.A., D.Sc, F.L.S. (With three Text-figures) . . 193 
Note on the Adjugate of Bezout's Eliminant of Two Binary Quantics. 
By Sir Thomas MuiR, LL.D . . . . 199 
Luminosity and its Origin in a South African Earthworm {Chilota 
Sp.?). By J. D. F. Gilchrist, M.A., Ph.D., D.Sc. (With 
Plate XXIV) . ... . ... . . 203 
