situation, extent, and nature of the nearest lands; the effect of which upon the incumbent atmosphere, when heated by the sun at those seasons in which he is vertical, is prodigious, and possibly superior to that of any other cause which contributes to the production or direction of wind. To trace the operation of this irregular principle through the several winds prevalent in India, and their periodical failures and changes, would prove an intricate but, I conceive, by no means an impossible task.* It is foreign however to my present purpose, and I shall only observe that the north-east monsoon is changed, on the western coast of Sumatra, to north-west or west-north-west by the influence of the land. During the south-east monsoon the wind is found to blow there, between that point and south. Whilst the sun continues near the equator the winds are variable, nor is their direction fixed till he has advanced several degrees towards the tropic: and this is the cause of the monsoons usually setting in, as I have observed, about May and November, instead of the equinoctial months.

(*Footnote. It has been attempted, and with much ingenious reasoning, by Mr. Semeyns in the third volume of the Haerlem Transactions which have but lately fallen into my hands.)