8 THE COCKROACH. 



Newport,* a naturalist of greater weight and interest, is 

 memorable for his skill in minute dissection, for his many 

 curious observations upon the life-history of Insects (see, for 

 example, his memoir on the Oil-beetle), and especially for his 

 early appreciation of the value of embryological study. 



Leydigf was the first to occupy fully the new field of Insect 

 histology, and point out its resources to the physiologist. In 

 all his works the student finds beauty and exactness of delinea- 

 tion, suggestiveness in explanation. Le^ydig's contributions to 

 Insect anatomy and physiology, valuable as they are to the 

 specialist, are not isolated researches, but form part of a new 

 comparative anatomy, based upon histology. Incomplete so 

 vast a work must necessarily remain, but it already extends 

 over considerable sections of the animal kingdom. 



* Newport. Art. "Insecta," in Cycl. of Anat. and Phys. (1839), besides many 

 special memoirs in the Phil, and Linn. Trans. 



f Leydig. Vom Bau des Thierischeu Korpers (1864), Tafeln zur vergl. Anatomic 

 (1864), Untersuchungen zur Anat. und Histologie der Thiere (1883), &c., besides 

 many special memoirs in Miiller's Archiv. , Zeits. f . wiss. Zool. , Nova Acta, &c. 



