"On this head, that of the application of chemistry to pyrotechny, we claim so much originality, as, so far as we know, to have been the first, who applied the principles of chemistry.... As this subject, however interesting to the theoretical pyrotechnist, cannot be understood without a knowledge of chemistry, it is obvious that that science is a powerful aid to pyrotechny.... Viewing pyrotechny either as a science or an art, there is undoubtedly required in its prosecution much skill and practice. The mere artificer or fireworker by constant habit may understand, it is true, how to mix minerals, prepare composition, charge cases, etc., ... but without a knowledge of chemistry he cannot understand the theory.... Indeed, chemistry is indispensable to pyrotechny." Much time and thought were given by Cutbush in the experimental development of this particular subject in his own laboratory. In reading upon the subject he had collected a vast material which was then put to crucial experimental tests. These, outside of his teaching hours, occupied his whole attention. An outline of how the work in the chemical department of the United States Military Academy was conducted will not be devoid of interest. _First Year_ Theory and Experimental Chemistry. _Second Year_ Application of Chemistry to the Arts, Manufactures and Domestic Economy, constituting along with Mineralogy the second course. Pyrotechny naturally was developed quite extensively. Teachers of chemistry will note with pleasure the questions which Cutbush arranged for his student corps, particularly those questions which had to do with pyrotechny: