402 MR, A. K. COOMARASWAMY ON THE [Aug. 1902, 
I desire to thank Prof. T. G. Bonney, F.R.S., and Mr. G. T. 
Prior, M.A., for occasional assistance and kind advice, and the 
latter for his analysis of forsterite. Iam indebted to Prof. Miers’s 
kindness for crystal-measurements which were made by Mr. Graham 
at Oxford, and to Mr. Herbert Smith for measurements of clino- 
humite. In Ceylon I have to thank Mr. Shand (Rakwane) and 
Mr. Holland (Balangoda) for their hospitality ; and also Mr. and 
Mrs. Nock, who rendered my stay in the new bungalow at Hakgala 
very pleasant. Mr. W. C. Hancock, B.A., has taken an interest 
in some of the chemical analyses, which he has made with great 
care, : 
II. Generar Descriprion or tHE LIMestones, 
The crystalline limestones form beds, the boundaries and foliation 
of which are parallel to the foliation (mineral banding) of the 
neighbouring granulites (fig. 2, p. 406). The outcrops vary in width 
from a few feet to more than a quarter of a mile. The most general 
strike is from north to north-west, and it is sometimes quite constant 
for many miles. 
The narrower bands of limestone are occasionally more intimately 
interbedded with the granulites than can be shown in the maps 
which illustrate this paper. The foliation of the limestone is 
marked by variation in coarseness of grain, in structure, and in 
mineral composition. Thus there are alternations of bands rich 
and poor in accessory minerals. The latter on the whole are more 
abundant near the contact with the granulite, but this difference is 
not always marked. Bands in which occur parallel intergrowths 
of dolomite and calcite may alternate with others in which 
ramifying intergrowths are found, or in which there is merely 
a granular mixture of carbonates, or dolomite or calcite alone. 
Calcite seems to predominate where accessory minerals most abound. 
The following accessory minerals are very characteristic: olivine, 
diopside, phlogopite, blue apatite, spinel, pyrite, and graphite ; 
less common are amphibole, clinohumite, magnetite, scapolite, 
sphene, and orthoclase. JI have never met with garnet or wollas- 
tonite associated with the limestones. 
The limestones often, contain nodular masses of silicates, recalling 
those that occur in the Glenelg Limestone.’ ‘These knots or nodules 
weather out of the limestone, with which they are often connected 
by only a small neck, so that they are easily detached. They vary 
from less than an inch up to several yards in diameter, and their 
constitution is various.” Many are white, and consist entirely of 
1 ©. T. Clough & W. Pollard, ‘On Spinel & Forsterite from the Glenelg, 
Limestone’ Quart. Journ. Geol. Soe. vol. lv (1899) p. 372. 
2 Here only those mineral-aggregates are referred to, that consist of accessory 
minerals characteristic of the limestones. It is not always possible, however, 
to draw a sharp line between these aggregates and inclusions of pyroxene- 
granulite in the limestone, which are peripherally rich in lime-silicates, diopside, 
phlogopite, and scapolite. 
