C r 3 6 ] 
It is to be remarked, that thofe only are fubjeft 
to this Diftemper, who are lately arrived from Eu- 
rope : The Inhabitants of the Country, as well as 
thofe who have abided there any time, are by no 
jmeans liable to it, and enjoy perfed Health during 
its greateft Violence. As the Crews of Ships arc 
very liable to this Diftemper, and more fo than the 
Officers and Paflengcrs, who have greater Variety of 
Pood and Liquor, it has been conceived, that the great 
Exercife and Labour ofthefe People, and their feed- 
ing upon fait Provifions, prepares their Conftitutions 
to be liable in this Climate to a Corruption of the 
Blood and Humours, from whence is fuppofed to 
proceed the Vomito Prieto. What muft beobferved 
is, that although the Crews of Ships fufFcr the 
greateft Slaughter, neverthclefs Paflengers and others, 
who go the Voyage under the greateft Advantages, 
with regard to the Conveniences of Life, are not 
free from being expofed to it. It muft be remarked 
alfo, that thofe Perfons, who, after having been ufed 
to this Climate, go from thence, and arc abfent even 
three or four Years, are not liable to it at their Re- 
turn, but retain their Health like the other Inhabit- 
ants 5 although in their Way of living they have not 
obferved the moft exad Regimen. 
The Defire of knowing the Caufe of this terrible 
Calamity has occupied from time to time the Minds 
of the Surgeons who make thisVoyage in the Galcons, 
as well as thofe of the Phyficians of the Country ; 
and their Opinion has been, that it chiefly takes its 
Rife from the Labour to which the Ships Crews 
are conftantly expofed, and their Manner of living. 
There is no doubt but thefe may greatly contribute 
thereto ; 
