Interesting letter from Robert Logue who, it appears, was agent for Brown & Son, Providence Rhode Island, assessing tornado damage to buildings they owned in Alton, Illinois.  "It is with reluctance I hve to inform yu of the late tornado that passed through this section of the country and done some damage but more so on the margin of the Mississippi river and which your dwelling & warehouse has suffered very materially at Alton. The heavy stack of chimney in the dwelling was so completely shattered by the winds as made it dangerous for any person to reside in it and the consequence of there falling would cokpletely ruin the roof of the principal house and more than probable ruin the dfloors & as the season was pressing on to the time of the year, the inclemencency of the weather would still be worse. I therefore order them to taken down and rebuild -- the roof of the warehouse was completely (unable to read) of and ruined . This I also have requested to be put in a state of repair." He goes on to discuss the cost of repairs, the contractor, and that he has a tennant for the house.  Interesting letter. According to historical records, Alton Illinois is in an area frequently hit by tornados. 

Found this note on a Brown & Son, which may or may not be the recipient of this letter: Browne & Sharpe Manufacturing Company. This business was established in 1833, by David Browne and his son, Joseph R., and has been conducted since under the firm-style of David Browne & Son, until the organization of the present company. In 1866, the rule and gauge making branch of J. R. Browne and Sharpe's business combined with Samuel Darling, adding the business formerly known as Darling & Schwartz of Bangor, Me. The new firm adopted the style of Darling, Browne & Sharpe, and have since carried on the manufacture of United States standard rules, Ames's universal squares, patent hardened cast-steel try-squares, the American standard wire gauge, bevel protractor, hardened T squares and bevels, and a great variety of steel and box-wood rules and also scales, and other small tools for machinists, draughtsmen, and wood-workers' use. The building is located on Promenade, near Park Street, and is, in all respects, fire-proof.

Postmark is among the better Illinois marks. This one is light, but legible.  Letter has some separations that do not affect text.