PARASITISM 363 



be referred to the circumstance that the injury to the host 

 ought not be so great as to prevent the completion of 

 at least one generation of the parasites, or the preparation 

 of one crop of eggs or embryos for future activity. The 

 waste in parasite eggs and embryos is immense; enor- 

 mous numbers are produced, few survive. 



REFEEENCES. 



R. LEUCKART: " Die Parasiten des Menschen, " etc., Leipzig, 1881. 

 M. BRAUN: "Tierische Parasiten des Menschen," Wiirzburg, 



1908. 



The New International Encyclopedia: Article upon "Parasites." 

 JOSEPH MCFARLAND: "Text-book on Pathology," Phila., 1910, 



Chapter upon Parasitism. 



