244 
in a submerged state freely produced capsules only, 
but were induced to produce normal flowers by grow- 
ing them in soil exposed to sunlight in the open air.— 
E. FF. Hallmann; Revision of the genera with 
Microscleres, ineluded, or provisionally included, in the 
family Axinellidge (Porifera), part i. The first part 
treats of the peculiar and aberrant genus Trachycladus, 
hitherto represented only by the briefly described T. 
laevispirulifer, Carter, and two species imperfectly 
described by von Lendenfeld, under the generic names 
Spirophora and Spirophorella. Seven additional repre- 
sentatives are described, three of which are designated 
as varieties of T. digitatus, Lendenfeld. The genus 
appears to constitute a connecting link between the 
Axinellidae and the Spirastrellidae, thus pointing to the 
possibility that these supposedly quite unrelated fami- 
lies may be derived from a common stem. 
Care Town. 
Royal Society of South Africa, September 27-—Dr. L. 
Péringuey, president, in the chair.—H. H. W. Pearson 
and Mary R. H, Thomson: Some stages in the life- 
history of Gnetum. An account is given of an 
investigation of the ovule and embryo-sac of Gnetum 
africanum (West Africa) and G. Gnemon (Ceylon) ; the 
material studied included also G. Buchholzianum 
(West Africa) and G. scandens (Poona, Darjeeling, 
Penang, Singapore), and two species of doubtful 
identity, one from Singapore and one from Java.—H. 
Bohle : The theory of automatic regulators. Automatic 
regulators may be classified as sluggish and fast regu- 
lators. The theory of each form of regulator is ex- 
plained in this paper.—T. F, Dreyer: Variation in the 
Mylabride illustrating a new theory of evolution based 
on Mendelism. 
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NATURE 
[NovEMBER 23, 1916 
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DIARY OF SOCIETIES. e 
THURSDAY, November 23. 
Royat Society, at 4.—Annual Report of Council.—At 4-30 —The Corrosion 
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CONTENTS. : PAGE 
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