The tick in his jaw belied how tightly his teeth were clamped.
In the same way, to infer a machine from hearing the regular tick of a clock, to infer a player from finding a pack of cards arranged in suits, to infer a human origin of stone implements, and all such inferences from patent effects to latent causes, though they appear to Jevons to be typical inductions, are really deductions which, besides the minor premise stating the particular effects, require a major premise discovered by a previous induction and stating the general kind of effects of a general kind of cause.
It was first recorded as poisonous by Livingstone and is now known to be the carrier of the Spirochaete of relapsing fever in man, known as tick fever.
Insects abound in great numbers, the most troublesome and destructive being the tick (Ixodes natalensis), which infests the pasturage, and the white ant (Termes mordax).
In the case of oxen the alternate host of the parasite is a special tick (Smith and Kilborne).
With one or two possible exceptions, like Argas vespertilonis, which has only been obtained from European bats, no species of tick is known to be confined to a particular host.
On the other hand, when food is not obtainable, life may be indefinitely prolonged if the tick be guarded from enemies and from atmospheric conditions inimical to existence.
The tick especially infests old huts and camping grounds and is nocturnal in habit, spending the day hidden in crevices of the walls or floor and coming out at night to feed upon the sleeping inmates.
Such a flame may jump down, for instance, to each tick of a neighbouring clock.
From the foregoing epitome which applies to many species, Rhipicephalus appendiculatus for example, it is evident that every individual tick has to find a host on three occasions, namely, as larva, nymph and adult.