eases. The extent of the growth of the sul)ject 

 of vitamins to which Funk has given sucli a tre- 

 mendous impetus can l)e judged not only by exces- 

 sive popularity, which it unfortunately acquired, 

 but by the unusual volume of work it had in- 

 spired in laboratories all over the world. In the 

 valuable monograph of Sherman and Smith, tl.o 

 second and revised edition of which we gladly 

 welcome, the bibliography alone occupies 175 

 l^rinted i)ages. which is half the space occupied 

 by the text of the monograph (350 ])ages. ) The 

 bibliography contains approximately 3500 titles 

 and, assuming that this list is exhaustive of the 

 studies on vitamins which have been published 

 for the last quarter of a century, this represents 

 an output of a new paper perhaps every two or 

 three days over that entire period. Undoubtedl}', 

 the quality of the work produced at such a pro- 

 lific rate did not keep pace with the Quantity ; 

 nevertheless, it signifies both an intense interest 

 in as well as a deep importance of the subject of 

 vitamins. Sherman and Smith trace the growth 

 of the subject in all its details and ramification;. 

 From an original number of three, our knowl- 

 edge has expanded within a very few years to a 

 definite recognition of six different vitamins And 

 if one reads the signs correctly, the "vitamin V>" 

 which has only recently been split into two sep- 

 arate entities may. in the near future, undergo 

 still further fractionation. Tn the case of a sul)- 



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