214 W. M. Hutchings—Ottrelite in North Cornwall. 
ice-sheet, however; but his facts show that the striz are quite 
divergent, following depressions and valleys in different directions. 
It seems probable, therefore, that here, as in Eastern Canada, local 
glaciers produce the chief striation observed, as pointed out by the 
- late Captain Kerr, R.N.1 But from its insular position, and lying as 
it does in the track of the Arctic currents, the coast areas must have 
been intensely eroded from icebergs and floating ice. 
Orrawa, CANADA. 
VII.—On tHE OccurRENCE oF OTTRELITE IN THE PHYLLITES OF 
Norru CornwaLt. 
By W. Maynarp Hurcutnes, Esq. 
HE mineral ottrelite, which has received so much attention 
elsewhere, especially in the Ardennes, and which is of con- 
siderable interest in connection with the metamorphism of certain 
rocks, has not, up to now, ever been reported as occurring anywhere 
in Great Britain. 
I am able to state that I have discovered it in considerable amount 
in a certain roofing-slate of North Cornwall. 
The slate in question is one of a series of specimens of the phyllites 
of the district collected by me during two successive summer holi- 
days at Tintagel. This series includes most of the roofing-slates of 
the neighbouring quarries, together with many other slates and 
slaty rocks, which, while closely of the same general nature as the 
roofing-slates, differ from them in not having sufficient hardness 
and fissility to render them fit for quarrying. I have long studied 
some of these rocks under the microscope, and latterly have been 
supplied, by the kindness of Mr. Teall, with material from the 
Ardennes for comparison, as well as with the principal original 
literature concerning them from the pens of Rénard, Renard and 
Vallée-Poussin, and Gosselet. The resemblance in many essential 
points between some of the Cornish rocks and some of the occur- 
rences described by these petrologists, is very interesting, and leads 
me to think that some account of the Cornish ottrelite-slate and its 
neighbours may be of some little value. 
I will first describe somewhat in detail the slate in which the 
ottrelite occurs, and the characteristics here shown by that mineral 
and by which it was identified. Owing to the close general resem- 
blance between all the phyllitic rocks of the district, it will after- 
wards be a very simple matter to point out the few details of 
variation. 
The ottrelite-slate in question is quarried in the cliffs near to 
Tintagel Church, the quarry being owned and worked by the 
Reverend Prebendary Kinsman, Vicar of Tintagel, to whom I am 
much indebted for the trouble he has kindly taken in forwarding 
more specimens, and in giving me information since my personal 
visit to the place. 
1 Ibid. p. 68. 
