PARASITES OF MAN AND DOMESTICATED 
ANIMALS. 
INTRODUCTION. 
The edifice of the world is only sustained by the impulse of hunger 
and love.—Schiller. 
The numerous letters received during the last few years 
from farmers, stock-raisers, dairymen, poultry-raisers and 
others, show that many of our domesticated animals suffer 
more or less from parasites, and as these special branches of 
farming receive now more and more attention, ashort treatise 
on parasites will be of some use. 
The term parasitism is used in this treatise in its widest 
sense, and the parasites mentioned in it may be living upon 
the hosts infested, permanently or only for a short time. 
In the struggle for existence animals and plants have 
been forced to adopt all sorts of peculiar methods to live; 
most of such methods are above-board, but others are at 
least dishonest or even worse. The majority of such beings 
are like honest farmers and mechanics; they till the soil or 
otherwise work for a living. Many, however, are not so 
honest, they rob the substance of others and thrive upon. 
material not produced by them or belonging to them. These, 
at first perhaps by force of circumstances, became in the be- 
ginning simply occasional beggers or robbers, but as they en- 
joyed such an easy life, in course of time their off-spring be- 
came so modified in form and structure that they could no 
longer take care of themselves but had tolead the dependent. 
mode of life first adopted by their.parents. Most of the so- 
called parasites belong to this group of organisms, be they 
animals or plants. They lead all sorts of peculiar and dark 
existences; some simply utilize the host, or the organism up- 
on which or in which they are found, as a means to reach 
the source of needed supplies, and in this case the hosts are 
