Some of these are not only deficient in clarifying power, but actually act as an absolute detriment by introducing impurities which lower the value of the juice as well as increasing the subsequent work of boiling and after working of the sugar. LA FABRICACION DE AZUCAR BLANCO EN LOS INGENIOS. By W. H. Th. Harloff and H. Schmidt. Translated into Spanish by C. J. Bourbakis. (Reviewed by Cleve. W. Hines, M. S., Station Superintendent.) This book is edited by two of the foremost sugar producers of the world, Mr. Harloff, who is manager of a large sugar factory in Java, and Mr. Schmidt, a very able consulting chemist and engineer. The book was originally written in Dutch and was translated into English, and now the Spanish edition has been completed, which will be welcomed by Spanish readers throughout the sugar world. While dealing with a purely technical subject, this work is so simple in its diction that it may be readily comprehended even by those of little technical training. The introduction is divided into five parts as follows: Part I.--The influence of alkalies and alkaline earths on the constituents of cane juice. Mention is here made of the formation of saccharates of barium, strontium, and calcium in low concentrations. The latter is made use of in the famous Steffens process of the beet-sugar industry. Part II.--The influence of acids on the constituents of sugar cane and the hydrolizing effect of dilute acids on sucrose and the resulting constituents, laevulose and dextrose or invert sugar, are explained. Part III.--The influence of heating on the constituents of cane juice is shown. Part IV.--The coloring substances of cane and those produced in the process of manufacture. Part V.--The different fermentations that occur in the sugar factory including lactic, butyric, alcoholic and dextran are discussed. The main part of the text deals with the manufacture of white sugar by the carbonitation and sulphitation processes, and particular attention is given to the acid-thin-juice-method which has been elaborated in the Java factories with such great success during the past few years. This book may be obtained from Norman Roger, 2 St. Dunstan's Hill, London, England. Price 7s. 6d. net (P4 Philippine currency). CURRENT NOTES--FIRST QUARTER. NOTES BY P. J. WESTER, Horticulturist in Charge of Lamao Experiment Station. Shield Budding the Mango.