A perusal of this pamphlet, dealing with the vitally important question of the “inheritance of acquired characters,” and in which the author meets the arguments urged against his criticisms of Weismann's doctrines, should prove most interesting, and it is not claiming too much for it to say that it will cause many a one to hesitate before proclaiming that “the last bulwark of the Lamarckian principle is untenable,” to quote Weismann.