398 
Uecent Agricidtural Fublications. 
place they occupied scrupulously disinfected, boiling water being 
recommended as the best agent for the latter purpose. For endo- 
parasites — those that infest the iiiternal organs of the body — the 
remedial measures should be determined by wliat is known as to 
the mode of introduction of the pests. The purity of the water 
supply should in particular be attended to. Avoidance of such 
watering places as ponds, streams, cisterns, &c., into which rain 
water passes, is necessary if these receive and retain various dejec- 
tions containing germs of parasites. In the exercise of precautions 
against some of the heteroxenous parasites (i.e., organisms which 
require more than one animal “host” in order that they may complete 
the cycle of changes that make up their life history), it is desirable to 
keep away the delinitive host ; for example, dogs should not be allowed 
FiCr. 1. — Tricliiiife encysted in mus- 
cular tissue. The cyst on the right 
contains two Trichiiife. — Colin. 
Fig. 2. — Tromhidium holoxericeum^ Linn. Female, 
seen from above ; magnified twenty diameters. — 
llailliet. 
to eat the heads of sheep which have died of “ gid ; ” flocks of sheep 
should be kept away from dogs which have tapeworms ; sheep should 
not be allowed to graze in damp pastures whei’e they may And snails 
infested with the cercaria of flukes. 
The body of the volume comprises eight books, which deal 
respectively with the following subjects : — 
T. Parasites of the Skin (298 pages). The two-winged flies 
(Diptera), the fleas, phthiriases, acariases (Figs. 2 and 3), summer- 
sores of horses, verminous foot-rot of sheep, ic. 
II. Parasites of the Digestive Apparatus (230 pages). Parasites 
of the mouth and pharynx, including thrush in calves, foals, and 
poultry, and diphtheria in fowls. Parasites of the gullet, stomac h, 
intestines, and liver. 
