300 



SCIENCE 



[N. S. Vol. XXIX. No. 738 



culosis is to be most highly commended, and 

 we suspect that much of the good he attributes 

 to climatic influences is due to this minute 

 personal attention, which is the keynote of 

 successful treatment in any climate. It 

 would be fairer, and the arguments have more 

 weight, if Dr. Bonney proved by statistical 

 comparison the marked advantages of Colo- 

 rado over what he considers less favorable 

 regions. 



In the treatment of hemorrhage on page 

 717, Dr. Bonney wisely, we think, advises 

 against the use of all drugs calculated to re- 

 duce the volume of blood in the lungs, as 

 worthless and harmful. On page 722, how- 

 ever, he speaks highly of placing ligatures 

 around the extremities, which act by reducing 

 the volume of blood, though the pathologic 

 changes which prevent the contraction of the 

 vessels at the site of bleeding must act with 

 equal force in both cases. 



The chapter on Theories of Immunity is 

 the weakest part of the book, and should be 

 omitted in the future, or re-written. The 

 text is far from clear, and many inaccurate 

 expressions are used, such as " toxic infec- 

 tion," " receptor cells," " protective poisons," 

 " bacilli emulsion," etc. If his description of 

 an antitoxin means anything it is that anti- 

 toxins consist of an excess of haptophores ! 



In describing Wright's technique we are 

 told that the film is so spread as to insure 

 even distribution of the cells. This is exactly 

 what we try to avoid, Wright having devised 

 a special method of spreading with the end of 

 a slide for the purpose of pressing the leuco- 

 cytes to the edges and end of the smear, to 

 facilitate counting. 



The italic is overworked throughout the 

 book. 



The names of Lassar, Delepine, Vallee, Gab- 

 bett, Descos and Larrier are misspelled. 



It is more easy to pick flaws than to con- 

 struct a book, but in a work of such general 

 excellence, it is particularly disappointing to 

 flnd such defects as have been pointed out. 



The printing is good, and the illustrations 

 throughout are first class, from the technical, 

 as well as the educational standpoint. 



In spite of the defects, and though we may 

 not agree with Dr. Bonney in some of his 

 views, we consider the book a valuable addi- 

 tion to our knowledge of the terrible disease 

 of which he treats. Not only the general 

 practitioner, for whom the book is written, 

 but the specialist will find it well worth care- 

 ful study. 



Mazyck p. Eavenel 



The World's Gold. A Discussion of the 

 Geological Occurrence of Gold, Its Geo- 

 graphical Distrihution, Its Extraction and 

 Methods of Milling, and the Economy of 

 Gold. By L. De Launay, Professor in the 

 Ecole Superieure des Mines. Cloth; 5J x 

 8i ins.; pp. 242. $1.75 net. New York, 

 G. P. Putnam's Sons. 



The preface of this work is an interesting 

 thesis on the function of gold in the world's- 

 industrial development. According to the 

 author, it is not only the basis of all wealth, 

 but it is " the whole of wealth " ; furthermore,, 

 it is a great civilizer and one of the most 

 powerful agencies making for the development 

 of the resources of the world. 



The chapters on the geological occurrence 

 and geographical distribution of gold are of 

 necessity, in a work of this character, unsatis- 

 factory and far from exhaustive. The same 

 may be said, and with greater force, of the 

 chapter on extraction and dressing of gold 

 ores — ^practically no definite or clear ideas can 

 be acquired by a perusal of these chapters. 

 However, from the standpoint of the econo- 

 mist, scientific details are not necessary. 



The main value of this work lies in the 

 chapter on the Economy of Gold, and it may 

 be said that in this respect it is a positive and 

 exceedingly valuable addition to the literature 

 on the relation of gold to money and com- 

 merce. 



L. de Launay examines the problem of the 

 future supply of gold from the scientific 

 standpoint and correlates the influence of this 

 supply with prices and the movement of cap- 

 ital from the financial standpoint. Thus he 

 performs the rare service of welding together 

 the technical and economical aspects of the 

 subject. 



