94 NATURE STUDY REVIEW [9 :3— Mar., 1913 



Pure Foods, John C. Olsen. 210 pages. Ginn & Co. $0.60. 



This is a very excellent simple presentation of the sub- 

 ject. Dr. Olsen is Professor of Analytical Chemistry at the 

 Brooklyn Polytechnic Institute. He writes clearly, concisely yet 

 interestingly. Here are some of the chapter headings: What 

 is Pure Food; Standard Rations and the Cost of Food; Milk; 

 Butter and Its Substitutes; Meats; Candies ; Fruits, Jams and 

 Jellies; Bread and Cereals; Spices and Condimental Foods. He 

 adopts a standard ration of 100 grams of protein, 100 of fat 

 and 420 of carbohydrates — a generous ration. In the preface 

 are these significant sentences which suggest the purpose of the 

 book: "The steel for our bridges and buildings is bought and 

 sold on the chemist's certificate of its composition to the thou- 

 sandths of per cent. The coal for our engines must be tested and 

 analyzed but the far more precious human organism is loaded 

 with a heterogeneous mixture of fuel of unknown composition. 

 We should not be surprised at low efficiency, inability to work, 

 sickness, even premature death of an organism which is given so 

 little intelligent care. 



Hygiene for the Worker, Wm. H. Tolman and Adelaide W. 

 Guthrie. 231 pages. American Book Co. $0.50. 



It is important to the laborer, to his employer and to so- 

 ciety that he keep well. This little volume tries to emphasize 

 those rules of hygiene and sanitation that apply particularly to the 

 worker. Aside from the chapters one would ordinarily expect 

 in any hygiene there are some suited especially to a work of this 

 type: Applying for a Position; Preparing for the Day's Work; 

 The Noon Hour; Hygiene of the Workroom; Occupational 

 Dangers; First Aid to the Injured. The book is well written, 

 lucid, emphatic and may well be added to every school library 

 to be read in whole or in part by every boy and girl. The chap- 

 ter on the "Choice of an Occupation" is especially suggestive 

 to those who are anticipating life's toil. 



