IT might be inferred from your notice of the new edition of the “Treasury of Botany” (NATURE, vol. ix. p. 300) that the stereotyped pages of the original text of that work—of which you are pleased to speak in terms of commendation—had been reprinted without alteration. Will you allow me space to state that this is by no means the case (as indeed is stated in the preface), but that a large number of corrections have been made, as may be detected by a keen eye in consequence of the slight difference which is observable in the type where the alteration has extended over two or three lines or more. Hence it is not to the Supplement alone that the reader must look for such of the “additions to botanical knowledge made during the last eight years” as it has been found practicable to include in the revised edition.