Trombidium (trombidium)

[NL. (Fabric i us, 1776, as Trombidion ).] A genus of mites, typical of the family Trombi diidæ. The body is divided into two parts. The small anterior and inferior part bears the eyes, mouth, and first two pairs of legs; the other, much larger, swollen and velvety, bears the last two pairs of legs. These mites are mainly parasitic, and many of them are bright-red. T. locust arum feeds Locust Mite ( Trombidium locust arum). IMG:content-0938.jpg:[blocks in formation] A trommel is a barrel in the form of a cylinder or of a truncated cone, horizontal or slightly inclined, turning round its own axis. It is the machine employed for similar purposes in most other industries; the only wonder is that so long a time elapsed before it was adopted in dre ing ores, for it furnishes the best po ible means not only of cleaning the ore, but also of sizing it. Call on, Lectures on Mining (trans.). [