390 ERUPTIVE OR PETECHIAL EEVERS. 



hibit any tendency to spread by contagion or infection ; and I 

 am of opinion that it is impossible to transmit it from the 

 horse to any other animal. 



Scarlatina is divided by medical writers into — (1.) Scarlatina 

 simplex ; (2.) Scarlatina anginosa ; (3.) Scarlatina maligna ; and 

 (4.) Scarlatina latens. 



Of these the two first are observed in the horse, what is called 

 the malignant form being identical with purpura; it is quite 

 possible, however, for any of the forms to degenerate into purpura. 



Scarlatina is usually associated with epizootic catarrh, and 

 occurs in animals that have been for some days suffering from 

 that disease ; and the production of such an alteration in the 

 blood as induces the scarlatina is due to defective ventilation or 

 drainage of the stable in which the animal has been kept, or 

 to over-crowding, by which the air becomes loaded with decom- 

 posing animal matters. Sometimes a weak constitution will 

 convert a catarrh into scarlatina, and the severity of an epizootic 

 disease may alter the blood, and give origin to scarlatina. 



Semiology. — 1. Scarlatina, simplex. — On the third, fourth, or 

 even as late as the sixth day after the commencement of epizootic 

 catarrh, the animal is seen to be covered with blotches, upon the 

 face, neck, body, and extremities. The blotches elevate the hair, 

 but in many places there is scarcely any elevation of the skin, for 

 if the hand be passed lightly over the apparent swellings, the 

 skin is felt but little altered. In other parts of the body, par- 

 ticularly upon the inner aspect of the thighs, actual elevations 

 of the skin in the form of rounded pimples can be both seen and 

 felt. The nasal membrane will be covered with scarlet spots of 

 variable size, and there will be a discharge from the nostril of 

 at first a thin serous mucus, which afterwards becomes yellow 

 or yellowish brown. The limbs are generally swollen, and the 

 animal stiff in consequence. In some instances, no eruption is 

 present, and the only evidence of scarlatina is found in the 

 Schneiderian membrane, and perhaps the membrane of one nostril 

 only will be covered with minute scarlet spots that escape the 

 observation of all but the practitioner. 



Soreness of the throat is almost a constant symptom, and if 

 it has preceded the rash, it will in all probability be more or 

 less increased ; but it by no means follows that soreness of the 

 throat will appear concomitant with the rash. In a few days 



