OUR DOMESTICATED ANIMALS. 93 



with the haeinatozoa of Grube and Delafond j but he sub- 

 sequently satisfied himself that this was an erroneous 

 view of the case. He found these worms in two old dogs ; 

 and from the second dog he obtained living examples, 

 which he succeeded in keeping alive for more than a 

 week after the death of the host. The largest of the 

 female worms did not exceed the 12th of an inch in 

 length ; and, commonly, from four to six full-grown para- 

 sites were found in a single drop of the venous blood 

 from a particular part of the body. The free embryos 

 gave an average length of ^" from head to tail. 



