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384 usually been ascribed to them, we applied to him for the authority on which he grounded his observation, and here subjoin his reply:

, February 23, 1836.

In compliance with your request, I have to communicate some facts in relation to the heights of the Rocky Mountains, and the sources whence I obtained the information.

In conversation with Simon M'Gillivray, Esq., a partner of the Northwest Company, he stated to me his impression, that the mountains in the vicinity of the route pursued by the traders of that company were nearly as high as the Himalayas. He had himself crossed by this route, seen the snowy summits of the peaks, and experienced a degree of cold which required a spirit thermometer to indicate it. His authority for the estimate of the heights was a gentleman who had been employed for several years as surveyor of that company. This conversation occurred about sixteen years since.

A year or two after I had the pleasure of dining at Major Delafield's with Mr. Thompson, the gentleman referred to by Mr. M'Gillivray. I inquired of him in relation to the circumstances mentioned by Mr. M'Gillivray, and he stated that, by the joint means of the barometric and trigonometric measurement, he had ascertained the height of one of the peaks to be about twenty-five thousand feet, and there were others of nearly the same height in the vicinity.

I am, dear sir, yours truly, JAMES RENWICK.

Esq.

In the course of this work, a few general remarks have been hazarded respecting the Indian tribes of the prairies, and the dangers to be apprehended from them in future times to our trade beyond the Rocky Mountains and with the Spanish frontiers. Since writing those remarks, we have met with some excellent observations and suggestions, in manuscript, on the same subject, written by Captain Bonneville, of the United States army, who had lately returned from a long residence among the tribes of the Rocky Mountains. Captain B. approves highly of the plan recently adopted by the United States government for the organization of a regiment of dragoons for the protection of our western frontier, and the trade across the prairies. "No other species of military force," he observes, "is at all competent to cope with these restless and wandering hordes, who require to be opposed with swiftness quite as much as with strength; and the consciousness that a troop, uniting these qualifications, is always on the alert to avenge their outrages upon the settlers and traders, will go very far towards restraining them from the perpetration of those thefts and murders which they have heretofore committed with impunity, whenever stratagem or superiority of force has given them the advantage. Their interest already has done something towards their pacification with our countrymen. From the traders among them, they receive their supplies in the greatest abundance, and upon very equitable terms; and when it is remembered that a very considerable amount of property is yearly distributed among them by the government, as presents, it will readily be perceived that they are greatly dependent upon us for their most valued resources. If, superadded to this inducement, a frequent display of military power be made in their territories, there can be little doubt that the desired security and peace will be speedily afforded to our own people. But the idea of establishing a permanent amity and concord amongst the various east and west tribes themselves, seems to me, if not wholly impracticable, at least infinitely more difficult than many excellent philanthropists have hoped and believed. Those nations which have so lately emigrated from the midst of our settlements to live upon our western borders, and have made some progress in agriculture and the