Of tlie stndy of elementary chemistry in schools is to educate the mind by giving it the right kind of exercise in tlie use of its powers, I have therefore tried to make a, judicious selection of the most fundamental facts and principles of chemistry, and to present these in such a way tliat the student must constantly use his senses to discover facts, his reason in drawing correct inferences from the data he collects, and good English in expressing accurately what he sees and thinks.
