摘要: CHEMISTS, in view of the immense strides which have been made their science during past few decades, are rather apt, unless they delved into historical side subject, to overlook fact that much present-day technique was known and practised by colleagues a hundred years ago; indeed, many ways relative skill greater then, since facilities for learning were very less, at same time themselves had construct own apparatus. The excellence work is no small tribute as craftsmen.