208 AUGUST 



LXV 



People who pry into the structure and habits of 

 Internal the humbler forms of life bring to light 

 some strange domestic histories. Zoo- 

 logy has been extended into so many ramifications 

 that it is impossible for any single individual to ex- 

 plore many of them for himself. He must rely on 

 the guidance of the experts who have devoted them- 

 selves to the investigation of separate provinces 

 the only way in which any advance can be made in 

 science beyond its present stage. Perhaps the 

 subject which possesses least temptation for the 

 average amateur is the study of those revolting 

 groups of animals which take up their abode within 

 the bodies of man and other animals. Nevertheless, 

 some general acquaintance must be had of these 

 creatures if any idea is to be obtained of the versa- 

 tility, complexity, and economy displayed in the 

 scheme of nature. No better general view of these 

 internal pirates could be presented than has been 

 done in a recent volume of the Cambridge Natural 

 History a publication which, when complete, will 

 constitute the standard British authority on animal 

 life. Messrs. Gamble and Shipley thoroughly com- 

 petent and trustworthy guides have dealt herein 

 with the endoparasitic groups, and it is worth over- 



