LETTERS TO THE EDITOR (The Times of London) Dear Sir, I am firmly opposed to the spread of microchips either to the home or to the office. We have more than enough of them foisted upon us in public places. They are a disgusting Americanism, and can only result in the farmers being forced to grow smaller potatoes, which in turn will cause massive unemployment in the already severely depressed agricultural industry. Yours faithfully, Capt. Quinton D'Arcy, J. P.