I Have read with great pleasure Mr. R. D. Oldham's interesting article in this Magazine, for October, 1887, on the gneissose rocks of the Himalayas. Mr. Oldham concurs with me in assigning an eruptive origin for the more or less gneissose rocks at Dalhousie, the Chor, and for almost all those in the Satlej Valley; and as I have in my published papers expressly intimated “my belief that some of the crystalline rocks of the north-western Himalayas are metamorphic gneisses” (Records Geol. Surv. India, vol. xviii. p. 110), I see no grounds for dissenting from his observations regarding the latter class of rocks.