[ «97 1 



He next proceeds to fliew the feveral analogies 

 that fubfift in the iymptoms of contagious difeafes ; 

 and as Animalada have been demonftrated in the 

 Jtch^ and, as he thinks, in the Byfentery too ; fo 

 he tells ns, they have been feen in the MeaQes, 

 by Langius j in the Peflilence, by Kircher ; in the 

 Siphylis, by Hauptman\ in Petechice, by Sigler\ 

 in the Smali-pox, by Lufitams and Porcellus ; as 

 alfo in the Serpigo, and other cutaneous afFedtions. 

 He then proceeds to adduce ail that occurs in de^ 

 fence of this theory, from the confideration of 

 fadts arifing in the following difeafes ; the 7/^*^; 

 Pyfenteryy Hooping-cough^ Small-po^c^ Meajles^ Plague^ 

 jand Siphylis. 



In the Itch^ the exiftence of the Acarus Sir&f 

 Syft. p. 1024,) is acknowledged, and he thinks ic 

 not lefs certain, that a fpecies of this genus exifts 

 as the caufe of Byfenteries : to this opinion the au- 

 thor was led by a fingular fad, that occurred to 

 Dr. Rolander^ during his refidence in ProfefTor 

 LiNN^us's houfe ; he had been infefted with the 

 Dyfintery for fome time, and had been relieved 

 twice by taking rhubarb, but the difeafe recurred, 

 commonly, at the end of about eight days. He 

 was the only one in the houfe thus affedted ; and 

 was put by the ProfelTor, upon examining his 

 egejia^ with a view to prove the truth of Bartho- 

 line's affertion, w^ho relates that he had feen the 

 alvine dejedlions full of the moft minute infedts 

 in this difeafe. Dr. Rolander's obfervation on his 

 own ftatc confirmed the fa6l ; and he afterwards 

 ^ifcoveredji %\\2iX thefe Animalcula were conveyed 



into 



