iv 
Contents. 
PAGB 
Note on the Abnormal Development of the G-enital Organs of 
Jasus Lalandii (Milne Edw,). By W. von Bonde, B.A. (With 
two text-figs.) .......... 119 
Colour and Chemical Constitution : Part III. — Derivatives of 
the Unknown Ortho-para-phenolphthalein. By James 
MoiR, M.A., D.Sc, F.I.C 123 
Spectrum-phenomena in the Chromium Compounds : Being Part 
IV OF THE Spectrum of the Euby and Emerald. By Jambs 
MoiR,M.A., D.Sc, F.I.C. . . . . . . * . .129 
On Rana fvscigula and B. angolensis. By Gr. A. Boulenger, LL.D., 
D.Sc, F.R.S. (Publislied by permission of the Trustees of the 
British Museum) .......... 
Henry Harold Welch Pearson, F.E.S 
The Torsion Problem for Bodies of Eevolution. By E. T. 
Stegmann. (Thesis approved for the Degree of Doctor of Science 
in the University of the Cape of Grood Hope.) (With Plates A, 
B, YIII— XVIII) 147 
Note on the Structure of the G-enital Organs of a True 
Hermaphrodite. By H. V. Exner, M.A. (From the 
Physioh^gy Laboratory, South African College) . . .181 
Colour and Chemical Constitution : Part IV. — The Eemaining 
Phthaleins. By James Moir, M. a., D.Sc, F.I.C. . . .183 
On the Genera Biplocystis 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 Perisporiace^. II. — Eevisional Notes. By 
Ethel M. Doidge, M.A., D.Sc, F.L.S. (With three text-figs.) 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 s^. ?). By J. D. F. Gilchrist, M.A., Ph.D., D.Sc 
(With Plate XXIV) 203 
131 
139 
