78 OTHER ITCH-MITES. 
etc., should be carefully disinfected. The ears of the affected 
dogs have to be kept clean, the dark substance found must 
be removed, and one or the other of the following mixtures 
should be injected. 
Olive-olovs, Saznwiecs ate ee 100 grammes 
Naphtho lige. stieee ster aera 10 
Hethersett ke vet ae eee 30 ss 
Some of this fluid, which has to be kept in a well-stop- 
pered bottle, should be injected every day into the external 
auditory canal, which is then closed for ten or fifteen minutes 
by a cotton plug to prevent the evaporation of the ether. 
A mixture of one ounce of olive-oil with one drachm of 
ointment of the nitrate of mercury, daily painted over the 
internal surface of the ear with asoft brush, has also answered 
the purpose. After a week the ear should be syringed out 
with tepid water and methylated spirit, about one to ten. 
The same or a very similar parasite has been found in 
the ear of the cat, where it causes extraordinary symptoms, 
the animal being almost unable to walk; in fact, when it at- 
tempts to do so it rolls about as if Fates Geel frequently 
falling over on its side. 
The ferret, which in many places is kept as a domesti- 
cated animal, is also affected by this or a very similar par- 
asite. 
The Itch-mites contain, besides those already de- 
scribed, a number of other small mites which infest birds. 
Such mites are found upon: nearly all birds, and whoever 
searches for them will discover new and most remarkable 
forms. The two forms,male and female, shown in fig. 43 and 
44, were found with others of a still different shape upon the 
Purple Grackle. Some of these mites are really beautiful ob- 
jects, which pass through wonderful and most complex 
metamorphoses.. Many torment their hosts, while others 
simply dwell upon them without causing any apparent dis- 
turbance or injury. In some cases each species inhabits only 
one kind of host, even a certain part of it, while others seem 
to care but little where they dwell providing the host is a 
bird. Every bird possesses one or more of such parasites, 
and cases are known where one bird gave a home to four 
