120 NATURE NOTES. 
The druses are filled with stiff clay, and some of the 
crystals are etched by the action of percolating water 
charged with organic acids. This etching takes place along 
certain lines other than the zones of growth or the planes 
of cleavage [ /']. 
Associated with the calcites, layers of  stalagmitic 
aragonite and thin films of malachite and chlorite are 
found. 
Agates also occur in this quarry; they are very poor in 
the upper part of the rock, but in the lower and more solid 
portion they are better. One specimen obtained measured 
15 by 11 by 24 inches. ROBERT DYKES, 
PECTOLITE AT CORSTORPHINE QUARRY. 
CRAIGPATH Quarry, Ratho, is well known for its specimens 
of pectolite, where it occurs in globular masses of a yellowish- 
white colour, the broken surfaces showing a stellate arrange- 
ment of acicular crystals. Normal pectolite is rare in 
Corstorphine Hill Quarry; but on one of the field meetings 
of the Society, a small specimen was obtained there. The 
quarry is rich in prehnite, for which a poor specimen of 
pectolite might be mistaken. There is very little difference 
in chemical composition between the two minerals. 
RoBERT DYKES. 
A New Locauity ror GoETrHITE. 
On one of the field excursions of the Geological section of 
the Society, goethite was found by the writer of this note 
on the south-eastern slope of Carnethy, above Penicuik. It 
occurs in veins, from one-sixteenth of an inch to a quarter 
of an inch thick, in radiating acicular crystals, having a 
jet black or steel-grey lustre. Carnelian, chalcedony, and 
