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A slight immunity from the attacks of acari and pediculi might in a tropical country more than compensate an animal for the loss of its hairy coat, especially in the case of the domesticated dog, which finds shelter with its master, has not to seek for its food at night, and is protected from the attacks of stronger animals.
The concealment of these tiny creatures during daylight renders it difficult to watch their proceedings, or to discriminate the precise species most actively engaged; but there is every reason to believe that the larvæ of the death-watch and numerous acari are amongst the most active.
Although a knowledge of such diseases is easy where it concerns parasites such as acari and worms, it becomes very difficult when it is a question of diseases that are caused by the Bacteriaceae.
The great trouble in treating this disease springs from its contagious character; for, no sooner is the animal, oftentimes, once free from the acari than it comes in contact with some object against which it has previously been rubbing, when the acari which were left upon that object are again brought in contact with the animal, and the disease is reproduced.
Suppose it be desired to photograph four different species of acari on one plate, the image of each when magnified to the desired extent only covering about one-fourth the exposed area of the plate.
The Osmia's larvæ, in fact, contrive to enclose themselves in an egg-shaped cocoon, dark brown in colour and very strong, which preserves them both from the rough contact of their shapeless cells and from the mandibles of voracious parasites, Acari, Cleri and Anthreni, those manifold enemies whom we find prowling in the galleries, seeking whom they may devour.
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