By ALBERT LADENBURG.

We translate the following important article, says the Chemists' Journal, from the Moniteur Scientifique of last month. It may be explained for the sake of our student readers that the word mydriatic is derived from the Greek mudriasis, which means paralysis of the pupil.

The synthetical researches which I have undertaken with a view to explain the constitution of atropine have shown me the necessity of studying the connection of atropine with the other alkaloids, which have an analogous physiological action. According to the early researches we could not discover any of these relationships which only become evident when we come to study the new discoveries which have been made in connection with the tropines, to which class belong both duboisine and hyoscyamine, which, although differing from atropine, are equally mydriatic in their action.