And when the inequality as to magnitude takes place at different times, such pulses become _undulatory_ and _vermicular_. And if irregularity of position be joined to them, they are called _spasmodic_ and _vibratory_. Let us begin with the undulatory, in which the whole artery is not dilated at the same time, according to the same inequality, but this part of it first, that second, that third, and that fourth, the motion continuing constant like the swelling of the waves. And some have the wave carried straight forward, some obliquely; some have a sufficient altitude in a short expansion as to length, and some conversely; some have a broad, and some a narrow, and they have the like inequality in regard to quickness and strength. When the undulatory is wholly diminished in size, it is called the vermicular, which resembles the motion of a worm. As the undulatory pulse, when it goes on diminishing, terminates in the vermicular, so in like manner does the vermicular in the _ant-like_, or _formicans_, when, most of its motions being lost, it terminates in one, and it a very small motion. It is called _formicans_ from its resemblance to the ant (_formica_), on account of its smallness and kind of motion. The _ant-like_ pulse (called formicans) is very small, there being none smaller than it; and, in like manner, it is of all others the most indistinct and dense, but is not quick, as Archigenes supposed. Nearly allied to it is the _hectic_. For as there is a hectic fever, so is there also a hectic pulse, which undergoes little or no variation, but remains always alike contracted as it first began, and never expanding, the whole habit being turned into disease. The _spasmodic_ pulses appear as if they were dragged, stretched, and drawn by the extremities, conveying the sensation of a stretched cord. But no such thing takes place in the _vibratory_; for in them the dilatation is greater, as if different parts of the artery were carried upwards at one and the same time. They may be resembled to darts, which, when thrown with force, are carried along with a vibratory motion. The pulse is _serrated_ when part of the artery seems to be dilated and part not; the artery itself also appearing to be harder than natural. This pulse has some of the characters of the vibratory, and is quick and dense, but not always great. In addition to those mentioned, there is a tenth kind of pulses arising from inequality, namely, that with regard to regularity and irregularity. The unequal pulses being divided into those which are alike as to periods, and those which are wholly unlike, the regular and irregular are formed according to each of these divisions; from the equality of periods the _regular_ is formed, and from the entire inequality the _irregular_. The equal pulse is also always regular (since consequently we call it alike); but the unequal is not altogether irregular; for, supposing it to have no equality, and