[Footnote Z: Fertilizers. The Source, Character, and Composition of Natural, Home-made, and Manufactured Fertilizers; and Suggestions as to their Use for Different Crops and Conditions. By Edward B. Voorhees. New York: The Macmillan Company. Pp. 335. Price, $1.] We have received, with only a short interval between them, the first volume of a third edition and the fourth or last volume of the second edition of _Alfred H. Allen's Commercial Organic Analysis_.[AA] The former volume is first to reach us. It is a high testimony to the value of the work in itself that the publication of a rival issue of the edition of 1885 had been begun by another house, although its age, as suggested by the date, would indicate that it had much need of revision. During the thirteen years since the publication of this edition later research has thrown new light on many features of the science and processes, and has corrected many of the old conceptions, and the author's views on some points have changed in the light of the more recent results, so that the preparation of a new edition had become necessary. Mr. Allen has found it now impossible for him to undertake the continuous labor which would be imposed by such a task, and the work of revision has been undertaken by Henry Leffmann, of Philadelphia. For this new edition Mr. Allen has furnished material on the subjects of the Kjeldahl process, proteids of wheat flour, vinegar, brewing sugars, malt substitutes, hop substitutes, and secondary constituents in spirits. Information has been added by the American reviser, partly from suggestions by Mr. Allen on the subjects of specific gravity, formaldehyde, vinegar, methyl, alcohol, acetone, fusel oil, argol, starch, glucose, invert sugar, lactose, and wine, and brief notes on other topics. Processes of the American Association of Official Agricultural Chemists have been reprinted. The revision of Vol. II is well in hand, and will be much more extensive than that of Vol I. [Footnote AA: Commercial Organic Analysis. A Treatise on the Properties, Proximate Analytical Examination, and Mode of Assaying the Various Organic Chemicals and Products employed in the Arts, Manufactures, and Medicine. By Alfred H. Allen. Third edition. Illustrated. With Revisions and Appendix by the author and Henry Leffmann. Vol. I. Introduction. Alcohols, Neutral Alcoholic Derivatives, Sugars, Starch and its Isomers, Vegetable Acids, etc. Philadelphia: P. Blakiston, Sons & Co. Pp. 557. Price, $4.50. The same work. Second edition. Revised and enlarged. Proteids and Albuminous Principles, Proteids or Albuminoids. Same publishers. Pp. 584. Price, $4.50.]