Should we demur to these eccentricities of an enthusiastic savant, he would perhaps point us to similar excesses in some of the acknowledged lights of intellectual progress, and cite as a recent instance of the madness of too much learning the ascription, by the brilliant yet matter-of-fact and practical Tyndall, of almighty "potency" to matter. Of course we should reply that Tyndall was a sincere and earnest student, and not a charlatan or a fanatic; whereto our author might respond, and respond justly, in sharp disclaimer of the latter brace of characters. He seems to be sincere: he can read and think, and does both, as the first part of his book, and much of the rest of it, show. He would have escaped the imputation we have suggested as not unapt to be cast upon him, secured a full hearing in a more respectable quarter, and gained higher aid in the development of his ideas, had he been less hasty in forming and stating some of his ultimate conclusions and the practical application of them. Many very able men who have preceded him in scientific labor, and who do not believe that "the bowels will be aroused into animation" by the exhibition of "a small strip of yellow glass three inches in depth, bordered by its affinitive violet," to the umbilical region, or that "Major Buckley developed one hundred and forty-eight persons so that they could read sentences shut up in boxes or nuts," would listen attentively to what he has to say on the anatomy of an atom, metachronism and "chromatic attraction." Around the World in the Yacht Sunbeam. By Mrs. Brassey. New York: Henry Holt & Co.