Page:Popular Science Monthly Volume 55.djvu/287

Rh 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.

On the other hand, the revision of the second edition has extended over fourteen years, and is only just completed with the fourth volume, which appears a few weeks later than the volume noticed above. The earlier volumes have been long out of print, and are destined, of course, to be supplanted by those of the new revision. The present fourth volume, being newer and of the present date, will serve as the latest till the last volume of the new revision is reached; and, besides, the author hopes to publish an appendix to each volume, containing the more important of the later results. The meaning of the term Commercial Analysis has been somewhat extended, and matter has been included that in closest strictness does not belong under it, it being thought better, the author says, to include all facts possessing an analytical or practical interest to him, in the belief that what he finds useful himself will be of value to others.

In The Porto Rico of To-day a traveler's view of that interesting island and its people is presented by Mr. A. O. Robinson, who went there and remained during August, September, and October, 1898, as correspondent of the New York Evening Post. While the book can not be regarded, as it does not profess and is not intended to be, as a source of geographical or statistical information, it admirably fulfills the design of the author to present a picture of the people and of the country as he saw them; and it is a very living picture too. He looked with a sharp eye, and has recorded what he saw in graphic style. In the author's story of his early days of the island we are made acquainted with the various names it has had, of which Porto Rico, or Puerto Rico, is only the latest. The oldest of the European names appears to have been Buriquién, in some one of the dozen or more spellings it has had, one of them being Bo. It has also been called La Isla de Carib, San Juan Bautista, etc. After the account of the author's first general impressions and experiences he describes the city of Ponce, his visit to a coffee district, a number of typical towns and villages, the journey from Ponce to San Juan, the highways, railways—of which there are one hundred and forty-three miles in operation and one hundred and seventy-five miles under construction—and a fairly effective telegraph system, views of the industrial possibilities and commerce of the island, with some experiences of military campaigning.

The publication of the revision which Mr. Herbert Spencer is making of his Synthetic Philosophy in order to incorporate in it as far as may be the results of more recent advances begins with the first volume of The Principles of Biology. The advance during the last generation, Mr. Spencer thinks, has been more rapid in the direction of this science than any other, and though the hope of bringing a work on biology at large up to date could not be rationally entertained at the author's age and under the existing conditions of his physical strength, a similar service to a work on the principles of the science did not seem impossible. Numerous additions have been needful. What was originally said about vital changes of matter is supplemented by a chapter on Metabolism. A chapter is added on The Dynamic Element in Life. The insertion of some pages on Structure fills a gap in preceding editions. The revelations of the microscope on cell life and multiplication are set forth. A supplementary chapter on Genesis, Heredity, and