General Carleton’s letter is here appended: HEAD QUARTERS COLUMN FROM CALIFORNIA, Tucson, Arizona, June 30th, 1862. _TO GENERAL GEORGE WRIGHT, U. S. Army, Commander Dep. of the Pacific, San Francisco, Cal._ MY DEAR GENERAL:—Soon after my arrival at this place I sent by a train to Fort Yuma, to be shipped to your address at San Francisco, a very large and beautiful AEROLITE, which I found here and which I had heard and read of for many years. In _Bartlett’s Explorations_, vol. 2, page 297, it is described as follows: “In the afternoon,” July 18th, 1853, “I called to take leave of General Blanco, and at the same time examine a remarkable _meteorite_, which is used for an anvil in a blacksmith’s shop. This mass resembles native iron, and weighs about six hundred pounds. Its greatest length is five feet. Its exterior is quite smooth, while the lower part which projects from the larger leg is very jagged and rough. It was found about twenty miles distant on the road towards Tubac and about eight miles from the road.” I desire that you present this aerolite to the City of San Francisco, to be placed upon the PLAZA, there to remain for the inspection of the people and for examination by the youth of the city forever. It will be a durable memento of the march of the _Column from California_. I am, General, sincerely and respectfully, Your friend and servant, JAMES H. CARLETON, _Brigadier General U. S. A._ Soon after this mass of meteoric iron came into the possession of the city, I obtained permission from the Board of Supervisors to have sawn from it a small piece for analysis and for distribution to a few of the principal public institutions in this country and Europe having collections of aerolites; this has been done, and also a fine photograph of it taken by Mr. C. E. Watkins, of which copies will be forwarded, with the specimens of the mass itself, as convenient opportunity offers. The piece intended for analytical examination was sent to Professor Brush of Yale College, and a letter has just been received from him giving the results, which will be found in the preceding pages, and which may appropriately be followed by a few remarks on the size and general appearance of the mass, with such other facts in regard to it as may be of general interest. The weight of the mass of which the analysis is given above was six hundred and thirty-two pounds, when it arrived in this city, and about two pounds have been since cut from it.