Having Heard Professor Renwick, Of New York, Express An Opinion Of The Altitude Of These Mountains Far Beyond What Had Usually Been Ascribed To Them, We Applied To Him For The Authority On Which He Grounded His Observation, And Here Subjoin His Reply:

Columbia College, New York, February 23, 1836.

Dear Sir, - 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 afterwards, 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.

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