512 GENERAL DISEASES. 



to the sheath and scrotum, and the testicles and the glands 

 of the groin become inflamed. There may be red spots, vesicles, 

 and ulcers on the outer surface of the penis. The orifice from 

 which urine is discharged (rueatus urinarius) is red, swollen, and 

 shows a slimy discharge. During the progi'ess of the disease, 

 these local changes may entirely disappear. The patient suffers 

 from strangury (p. 442) and often from sexual excitement. His 

 appetite continues good, although he falls away in condition ; 

 and his loins become very sensitive to pressure. 



In the mare, the surface of the genital organs is generally 

 swollen, thickened, more or less studded with red spots, gelatinous 

 elevations, vesicles, and ulcers, and covered with a muddy orange- 

 coloured secretion. As in the horse, the local changes in the mare 

 may be insignificant. Usually, the clitoris is swollen and erect, 

 and the mare suffers from excessive sexual excitement, and 

 strangury. She discharges urine in small quantities at a time, 

 or a slimy discoloured secretion (mucus). She keeps whisking her 

 tail about, is very ticklish, and constantly " horses." The urine 

 and mucus from her genital organs soil the tail and thighs, and 

 may scald the skin of the parts upon which they lodge. The 

 swelling and inflammation of the vulva and vagina may extend 

 to the udder and lower part of the belly. 



Second period, or iieriod of wJieals.— 'between the fortieth and 

 sixtieth day, the patient, especially if it be a stallion, generally 

 gets an attack of nettle-rash which takes the form of sharply- 

 defined, round, flat eminences, which may be raised about f of 

 an inch above the surface of the skin, and which may vary in 

 size from that of a shilling to that of the palm of the hand. 

 These eminences may appear or disappear very rapidly, and 

 may change their position from time to time. The hair over 

 them stands on end, and the skin which covers them is unusually 

 thiok. As a rule, they persist for several weeks, during which 

 time they become moderately hard, and then slowly disappear. 

 Their favourite sites are the croup, neck, shoulders, chest, and 

 belly. Oagny and Gobert regard these wheals as characteristic of 

 dourine. Occasionally, no wheals appear, and flat patches of skin 

 on which the hair stands on end, take their place. Sometimes 

 there is intense itchiness (pruritis) of the skin, which is mani- 

 fested by the animal rubbing and biting itself, so that exten- 

 sive sores on the skin are produced. The mucous membrane 

 of both stallion and mare often show white spots, which cor- 

 respond to the positions previously occupied by ulcers that have 

 healed. The lymphatic glands are often swollen all over the 

 body. The animal gets lame behind, on account of inflammation 

 of the joints and tendons. At this period, affected stallions are 



