If in our Catholic schools Physical Sciences were rightly and fully taught, the evil would be less. But what we call Government schools are, for the most part, obligatory; and, by reason of the method prescribed, even for private schools it is impossible to elucidate those doctrines without which the pupils are neither instructed sufficiently nor prepared for resisting the temptations of the Universities. By this treatise we cannot hope to be of use directly and immediately in the public schools of the Government: but we can hope to do something indirectly and mediately.