Abstract
Every one knows that if steel instruments are sterilized by boiling in pure water, they become covered with spots of rust. It is usual to guard against this by adding to the water 1 per cent. of sodium carbonate. Some surgeons complain that this process gives no uniformity of result, their instruments sometimes coming out bright, and sometimes badly spotted. As the rusting is a simple chemic process, the results ought always to be the same if the conditions are uniform. The following experiments were made to ascertain the effect of boiling under different conditions. A quantity of thin polished steel plates, each one inch wide and two inches long, were made for me by a cutler. These were washed well in ether, and then soaked in a bath of ether for some hours to remove all oily matter from the surface. Also two plates of aluminium, each two inches
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