36 Dana — American Journal of Science, 1818-1918. 



pages. The number of critical notes, abstracts, book 

 reviews, etc., could be also given, were it worth while, but 

 what is much more significant in this connection, than 

 their number or aggregate length, is the fact that these 

 notices are in a large number of cases — like those of Gray 

 in botany — minutely critical and original in matter. 

 They thus give the writer's own opinion on a multitude 

 of different subjects. It was a great benefit to Dana, as 

 it was to science also, that he had this prompt means at 

 hand of putting before the public the results of his active 

 brain, which continued to work unceasingly even in times 

 of health prostration. 



This may be the most convenient place to add that as 

 Dana became gradually less able to carry the burden of 

 the details involved in editing the Journal in addition to 

 his more important scientific labors, particularly from 

 1890 on, this work devolved more and more upon his son, 

 the present editor, whose name was added to the editorial 

 staff in 1875, with volume 9, of the Third Series. The 

 latter has served continuously until the present time, 

 with the exception of absences, due to ill health, in 1893-94 

 and in 1903 ; during the first of these Professor Henry S. 

 Williams and during the second Professor H. E. Greg- 

 ory occupied the editorial chair. 



The Third Series began in 1871, after the completion 

 of the one-hundredth volume from the beginning in 1818. 

 At this date the Journal was made a monthly and as such 

 it remains to-day. Fifty volumes again completed this 

 series, which closed in 1895. 



The Fourth Series began with January, 1896, and the 

 present number for July, 1918, is the opening one of the 

 forty-sixth volume or, in other words, — the one hundred 

 and ninety-sixth volume of the entire issue since 1818. 

 The Fourth Series, according to the precedent estab- 

 lished, will end with 1920. 



Associate Editors.- — In 1851 the new policy was intro- 

 duced of adding "Associate Editors" to the staff. The 

 first of these was Dr. Wolcott Gibbs of Cambridge. He 

 began his duties with the eleventh volume of the Second 

 Series in 1851 and continued them with unceasing care 

 and thoroughness for more than twenty vears. In a note 

 dated Jan. 1, 1851 (11, 105), he says: 



