Achor 61 qu. (from bran; so called from the branny scales thrown off). Lactumen: abas, acores, cerion; favus. The crusta lactea of authors, and in England the scald head. Trallian says, that it is a sore on the outside of the head, full of little perforations, which discharge a humour like ichor. He adds, that the cerion resembles an achor; but that the mouths of the perforations are larger, resembling the ceils of a honey-comb, whence the name; the matter is also nearly of the consistence of thin honey. When these diseases spread, the serum which oozes out dries, and forms a scab. It is, however, in general, only an obstruction in the circulation of the bulbs of the hair, and sometimes of the sebaceous glands.

Dr. Willan, in his description of different kinds of pustules, defines the achor, a pustule of intermediate size between the phlyzacium and psydacium, which contains a straw-coloured fluid, having the appearance. and nearly the consistence, of strained honey. It appears most frequently about the head, and is succeeded by a dull white or yellowish scab. Pustules of this kind, when so large as nearly to equal the size of phly-zacia, are termed ceria. or favi, being succeeded by a yellow, semi-transparent, and sometimes cellular scab, like a honey-comb.

The achor differs from the favus and tinea only in the degree of virulence. It is called favus when the perforations are large; and tinea when they are like those which are made by moths in cloth: but generally by tinea is understood a dry scab on the hairy scalp of children, with thick scales and an offensive smell; when this disorder affects the face, it is called crusta lactea, or milk-scab. Mr. Bell, in his Treatise on Ulcers, says, that the tinea capitis and crusta lactea may both be reduced to the same species of herpes, viz. the herpes pustulosus,(which see,) they being naturally the same, differing only in situation; the tinea is on the hair scalp, and the crusta lactea on the face. Dr. Cullen improperly places this disease under Ulcus; as a synonyme; where also he places the Crusta lactea; but the whole class locales is very carelessly arranged. When it happens to children, if in other respects they are healthy, the best treatment, besides keeping the belly moderately lax, is cleanliness and a moderate diet; an issue may be made and continued till the disorder is cleared and the strength of the constitution established; the hair must be kept short, and the head washed with soap-suds. Some instances of this sort are very difficult of cure, and attended with violent itching, a pale countenance, etc.; but still the same method generally succeeds in all the species and degrees of virulence. Small doses of calomel may be given as an alterative rather than as a laxative, and the vinum antimon. in such doses, at proper intervals, as the stomach will easily retain. Though in general it is a local disease, yet the constitution is sometimes in fault, and internal remedies should not be neglected. When hastily and imprudently repelled, also, disagreeable consequences have ensued.

Externally, washing with soap, particularly the black soft soap, and occasionally using the ung. e pice, will succeed; but, in the more inveterate cases, the un-guentum ad scabiem of Banyer's Pharmacopoeia Pau-perum, (quod vide,) lowered with an equal part of axyngia, is necessary. Should this fail, the only remedy is to pull out each hair, by tweezers, or to put on a pitch cap, which when taken off draws them out at once - a cruel practice, but sometimes indispensable. A wash, consisting of a solution of corrosive sublimate, in the proportion of ten grains to a pint of water, has sometimes succeeded. The unguentum picis cum sul-phure of the Pharmacopoeia of Guv's Hospital is often advantageous; but the head must be constantly close shaved, and an oil-skin cap worn, which, alone, will sometimes cure the complaint. This ointment is composed of half a pound of tar, half an ounce of wax, and two ounces of flour of-sulphur. More lately, shaving the head, and keeping up a steady pressure by means of slips of sticking plaster, have appeared more effectual than the oil-skin cap.

Among the ancients, Aetius, Aegineta, Trallian, Oribasius, Galen, etc. treat professedly on these disorders: amongst the later authors, Heister and Turner may be consulted, with the still later writers, as Bell, in his Surgery, and his Treatise on Ulcers, p. 376; Moss on the Management of Children, &c; White's Surgery, p. 69.