September 4, 1891.J 



SCIENCE, 



139 



ouse a constant growth in the power of thought, analytic and 

 synthetic. It may be noted also that a definite plan is followed 

 with respect to diagrams: lines mentioned in the statement, for 

 instance, are solid, unless planes intervene; while all additional 

 lines, mentioned in the construction, are dotted, the more impor- 

 tant lines being heavier than those of lesser importance. More- 

 over, the diagrams and their demonstrations, throughout the vol- 

 ume, are invariably so placed that they may both he seen without 

 turning a leaf — either on the same or on facing pages. 



— A third edition has recently appeared of Frazer's ''Tables for 

 the Determination of Minerals." This book is based, as is well 

 known to many Science readers, on one by Weisbach, which was 

 first published in 18C6. The purpose is to aid the student in de- 

 termining minerals by their physical properties as distinguished 

 from the chemical reactions which they give. That it is possible 

 so to arrange tables that it shall be in the main possible, by their 

 use, for the student to determine a mineral from its color, lustre, 



streak, hardness, crystalline form, and cleavage, has been shown 

 by the reception which this book has had through its various 

 editions. Many know how much that was antiquated in chemical 

 science has clung to the text books of mineralogy, and it was one 

 of Dr. Frazer's aims in the production of this new edition of his 

 "Tables" to eliminate all of this old and substitute formulas, etc., 

 more in accordance with the present state of chemical science. 

 The book is well known, so it seems unnecessary to commend it to 

 our readers more than by saying that this edition is to a great 

 exlent quite new (Philadelphia, Lippincott). 



— The American Book Company has published •' The Principles 

 of Agriculture for Common Schools," by .J. O. Winslow. This is 

 quite a departure from the usual run of school books, and will in- 

 terest many who wish to see the elements of science taught in the 

 schools. The book is not limited to what would usually be called 

 agricultural science, but contains snatches from all branches of 

 science which have a bearing on agriculture. 



Exhausiion 



The phosphates of the system 

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 and exhaustion usually indicates 

 a lack of supply. The Acid 

 Phosphate supplies the phos- 

 phates, thereby relieving exhaus- 

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 for labor. Pleasant to the taste. 



Dr. A. N. Krottt, Van Wert, 0., says: 

 " Decidedly beneficial in nervous exhaus- 

 tion . " 



Dr. S. T. Newman, St. Louis, Mo., says: 

 ' ' A remedy of great service in many 

 forms of exhaustion." 



Descriptive pamphlet free. 



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