[ 169 ] 
CHAP. XVIII. 
Of the I t c h, 
rpHE Microfcope has difcovered, what 
without it could fcarce have been ima¬ 
gined, that the Diftemper we call the Itch 
is owing to little Infedts under the Cuticula, 
whofe continual Bitings caufe an ouzing of 
Serum from the Cutis , and produce thofe 
Puftules or watry Bladders whereby this Dif- 
eafe is known. This was found out by 
Dr. Bononio, * who obferving that itchy 
People frequently pull out of their fcabby 
Skin little Bladders of Water with the Point 
of a Pin, and crack them on their Nails like 
Fleas, he determined to examine what thefe 
Bladders might really be. Wherefore, pick¬ 
ing out with a fine Needle a little Puftule 
from a Place fcabbed over, and where there 
was a fevere Itching, he fqueezed a thin 
Matter from it, and perceived a very fmall 
white Globule fcarcely difcernible, which., 
applying to the Microfcope, he found to be 
a very minute Animal, in Shape refembling a 
Tortoife, of a whitifh Colour, but darker on 
the Back than elfewhere, with fome long 
and thick Hairs iffuing from it, very nimble 
in its Motion, having fix Legs, a fharp Head, 
* Phil # Tran fad. Numb. 2-83. 
sad 
ft.' 
v • ■ • * 
