1897] NOTES AND COMMENTS 15 
within the ovary cavity, namely in Baeckea diosmifolia (a member 
of the myrtle family). Certain ovaries of quite normal external 
appearance contained numerous perfect or sometimes imperfect 
stamens, but no trace of any ovules. 
SomME Basic DYKE-ROCKS FROM SOUTHERN INDIA 
A RECENT issue of the Records of the Geological Survey of India 
(vol. xxx. part 1.) contains a paper by Mr T. H. Holland dealing 
with certain basic dykes widely distributed in Peninsular India. 
On both geological and petrographical grounds they are correlated 
with the Cuddapah lava-flows, and they shew none of the effects 
of dynamic metamorphism so general in the older series of dykes 
referred to in the Dharwar system. The author treats the rocks 
under three groups: olivine-norite, augite-norite, and augite-diorite. 
The first consists essentially of olivine, enstatite, augite, and a basic 
plagioclase, with subordinate biotite. The second lacks olivine, and 
has more augite relatively to enstatite. In the third group biotite 
and usually enstatite have disappeared, a comparatively late crys- 
tallization of augite gives a tendency to the ophitic structure, and 
interstitial micropegmatite (sometimes with potash-felspar) is invari- 
ably present. Considerable variations occur, including transitions 
in the first group to peridotites and in the second to pyroxene-rocks. 
To each group there are ‘ hemicrystalline’ equivalents corresponding 
with the rocks of plutonic habitus, and some of these present types 
not hitherto described but comparable with the limburgites or 
magma-basalts. These contain phenocrysts of olivine, of enstatite, 
or of both minerals in a dark compact matrix, largely of glass. The 
author also points out resemblances between the dyke-rocks and the 
Cuddapah lavas of which they are the probable equivalents. 
The rocks styled augite-diorites seem to be practically identical 
with some which in this country have been termed quartz-bearing 
gabbros, etc., and the author makes an interesting comparison 
between the Indian examples and those of Carrock Fell, St David's 
Head, and Carlingford, with the well-known rocks of Penmaenmawr 
and the Whin Sill. He finds no evidence to support Professor 
Sollas’ suggestion that the micropegmatite in such rocks is the result 
of a later injection of a distinct acid magma into minute veins and 
druses. He regards it as the final product of crystallization of the 
rock formed under somewhat changed (‘aqueo-igneous’) conditions, 
consequent upon the concentration of the original water in the 
residual magma. He suggests that distinct veins of granophyre 
traversing the rock, as described by Sollas in the Carlingford dis- 
trict, may be ‘contemporaneous veins’ rather than later injections, 
