A SKETCH OF HIS LIFE 29 



the impressions thus made were strong may be gathered from the 

 fact that many years later he urged the writer to study the devel- 

 opment of this shrimp, if possible, and that after the lapse of 

 nearly a quarter of a century he wrote the graphic account of the 

 behavior of the hermit crab which appears in the introductory 

 lecture of his work on "The Foundations of Zoology." 



Altogether there are about fifteen papers on the embryology, 

 metamorphosis, habits and classification of the higher Crustacea 

 which singly or jointly bear the name of Brooks, and all were 

 issued during a period of fourteen years, from 1879 to 1892. More- 

 over, his "Handbook of Invertebrate Zoology" contains much 

 original matter pertaining to this class of animals. His first con- 

 tribution in this field was on the larval stages of the stomatopod, 

 Squilla empusa, and represented the first "Scientific Results of 

 the Chesapeake Zoological Laboratory" for 1878, and it was 

 upon tne adults and the larvaB of this sub-order that some of his 

 most notable work was later accomplished. 



At Beaufort, North Carolina, during the season of 1880, Brooks' 

 interest in Crustacea deepened, for he saw in their structure and 

 in the metamorphosis which they so beautifully displayed, a 

 means of attacking several larger problems, such as "the laws of 

 larval development," the analysis of secondary adaptations, and 

 the meaning of metamerism in both the lower and higher animals. 

 He had pondered over the works of Professor Claus on crustacean 

 development and morphology, and for upwards of four years, from 

 1880 to 1883, his own elaborate notes and pen drawings on the 

 Macrura had grown to such an extent that they filled a large 

 portfolio. From this source he drew materials from time to time 

 for publication, as certain subjects happened to engage his special 

 attention. Without doubt he had contemplated an extended 

 monograph, which was only partially fulfilled in the work on 

 'The Embryology and Metamorphosis of the Macrura," pub- 

 lished in 1892. 



The works by which Brooks will be best known to all future 

 students of crustacean zoology are undoubtedly his monograph 

 on "Lucifer: A Study in Morphology," published in the Philoso- 

 phical Transactions of the Royal Society of Great Britain for 



