Dana — American Journal of Science, 1818-1918. 35 



The Second, Third and Fourth Series. 



The Second Series of the Journal, as already stated, 

 began with January, 1846. Up to this time the publica- 

 tion had been a quarterly or two volumes annually of two 

 numbers each. From 1846 until the completion of an 

 additional fifty volumes in 1871, the Journal was made a 

 bimonthly, each of the two yearly volumes having three 

 numbers each. Furthermore, a general index was given 

 for each period of five years, that is for every ten 

 volumes. 



Much more important than this change was the addi- 

 tion to the editorial staif of James Dwight Dana, Silli- 

 man's son-in-law. Dana returned from the four-years 

 cruise of the Wilkes Exploring Expedition in 1842; he 

 settled in New Haven, was married in 1844, and in 1850 

 was appointed Silliman professor of Geology in Yale 

 College. He was at this time actively engaged in writ- 

 ing his three quarto reports for the Expedition and 

 hence did not begin his active professional duties in Yale 

 College until 1856. Part of his inaugural address was 

 quoted on an earlier page. 



Dana had already performed the severe labor of pre- 

 paring the complete index to the First Series, a volume 

 of about 350 pages, finally issued in 1847. From the 

 beginning of the Second Series he was closely associated 

 with his brother-in-law, the younger Silliman. Later the 

 editorial labor devolved more and more upon him and the 

 larger part of this he carried until about 1890. His work, 

 was, however, somewhat interrupted during periods of ill 

 health. This was conspicuously true during a year's 

 absence in Europe in 1859-60, made necessary in the 

 search for health; during these periods the editorial 

 responsibility rested entirely upon the younger Silliman. 

 Of Dana's contributions to science in general this is not 

 the place to speak, nor is the present writer the one to 

 dwell in detail upon his work for the Journal. This sub- 

 ject is to such an extent involved in the history of geology 

 and zoology, the subjects of several succeeding chapters, 

 that it is adequately presented in them. 



It may, however, be worth stating that in the bibliog- 

 raphy accompanying the obituary notice of Dana (49, 

 329-356, 1895) some 250 titles of articles in the Journal 

 are enumerated; these aggregate approximately 2800 



