Professor Jaffa, too, of the University of California, has been doing most valuable service in testing the usefulness of fruits and nuts as human foods. He generously furnished the author with elaborate tables of his results, covering several years of observation, showing low nitrogen possibilities similar to those demonstrated by the writer and his colleagues at Cambridge and Yale. These have since been published, and relating to special kinds of foods, as they do, suggest a wide range of choice among the fruits of earth; but the collected evidence of this book shows that human nutrition is best served when the appetite, being kept at normal, is allowed to make selection from the whole range of nutritious products furnished by good Mother Nature.

Dr. H. P. Armsby

In the Oct. 16th, 1903, number of Science, also, is an interesting article by Dr. H. P. Armsby on the heat values and muscular energy values of different food elements and their iso-dynamic replacement of each other under various conditions. - Horace Fletcher].