THE CHEESE-MITE- -THE DOG-TICK. 541 



ulcers, which are often of very dangerous consequence to the patient, 

 BO much so, indeed, that he knew a soldier, the soles of whose feet 

 were obliged to be cut away before he could recover; and some men 

 have lost their limbs by amputation; nay, even their lives, by having 

 neglected, in time to root out these abominable vermin. The moment, 

 therefore, that a redness and itching, more than usual, are perceived, 

 it is time to extract the Chigoe that occasions them. This is done 

 \\ith a sharp-pointed needle, taking care not to occasion unnecessary 

 pain, and to prevent the Chigoe, or bladder, from breaking in tte 

 wound. Tobacco ashes are put into the orifice, by which, in a little 

 time, the sore is perfectly healed." 



OF THE TICKS IN GENERAL. 



THESE troublesome insects live chiefly on other animals: some of 

 them, however, inhabit the water, and others subsist on various 

 vegetable substances. They are to be found every where, and in 

 Immense numbers. The larvce and chrysalids have each six feet. 



Their rnouth is not furnished with a proboscis, but the sucker has 

 a two-valved, cylindrical sheath. They have two compressed feelers, 

 as long as the sucker; two eyes, one on each side of the head; and 

 eight legs. 



THE CHEESE-MITE. 



To the naked eye, these minute creatures appear little more than 

 moving particles of dust; but on the application of 

 the microscope they are found to be perfect insects, 

 performing all the regular animal functions. 



The females, which are easily distinguished from 

 the males, are oviparous. The eggs are so minute, 

 that on a tolerably accurate calculation it appears, 

 that ninety millions of them would not fill the shell of 

 a pigeon's egg. 



Mites are very quick-sighted ; and when once they have been 

 touched with a pin, it is easy to perceive a great degree of cunning 

 exerted to avoid a second touch. They are extremely voracious ani- 

 mals, and are often observed even to devour each other; and so very 

 tenacious are they of life, that they have been kept alive many months 

 between tvo concave glasses, by which they were applied to a micro- 

 cope. 



THE DOG-TICK. 



In thickets and heaths these Ticks are sometimes very abundant. 

 Hence it is that animals which frequent such places, and particularly 

 dogs of the chase, are much exposed to their attacks. 



THE CHEESB-MITiC. 



