PREFACE. 



XI 



expensive form, and thus be adapted to more general 

 use. I have, accordingly, re-written the description of 

 the species and varieties, adding such remarks on the 

 properties of external form, and the principles and 

 practice of breeding, as may supply, in part, the want 

 of the original figures. I have likewise added to the 

 description of the other animals, that of the Dog, both 

 on account of the general interest of the subject, and 

 of its particular relation to the production of varieties, 

 and the effects of breeding. 



