ERUPTIVE FEVERS. 



the smallpox twice, it is proper to study this disease, and to dis- 

 tinguish it from the genuine smallpox. 



DCXXXII. This may be generally done by attending to 

 the following circumstances. 



The eruption of the chickenpox comes on with very little fe- 

 ver preceding it, or with fever of no determined duration. 



The pimples of the chickenpox, more quickly than those of 

 the smallpox, are formed into little vesicles or pustules. 



The matter in these pustules remains fluid, and never ac- 

 quires the colour or consistence of the pus which appears in the 

 pustules of the smallpox. 



The pustules of the chickenpox are always, in three or four 

 days from their first appearance, formed into crusts. 



See Dr. Heberden in Med. Transact. Vol. I. art. xvii. 



CHAP. III. OF THE MEASLES. 



" The character of this disease (See Synopsis, gen. XXVIIT.) is 

 clear, and not liable to any ambiguity that I know of. I must 

 only say, that it becomes a little doubtful by my comprehending 

 under it the Rubeola varioloides, what in Scotland we call the 

 Nirles, a disease so slight in its symptoms, and short in its 

 duration, that I find but few physicians well acquainted with it ; 

 and it is not of frequent occurrence. It is arranged under the 

 same title as the common measles, because it is attended with 

 the peculiar symptoms of catarrh, &c. ; but it differs in this, that 

 the papillae which occur here, are not in such clusters as those 

 of the measles. They are more distant and more observable, 

 more eminent and considerable, and they get more or less of a 

 vesicle on the top ; but this disappears without any sensible sup- 

 puration, and, in the course of a day or two, falls off in a scale or 

 very small crust. Whether it is to be considered as a conta- 

 gion of a distinct kind, or comprehended under the Rubeola, I 

 shall not here determine. It has several times occurred to me, 

 but I did not attend to it so as to be able to establish this 

 point." 



