ADVERTISEMENT TO THE FIRST EDITION, 



1772. 



THE following sheets are neither correct enough for the pub- 

 lic eye, nor full enough for the most part of readers ; but the 

 apology is, that they are intended only for those who are to 

 hear "them fully explained. 



ADVERTISEMENT TO THE SECOND EDITION, 



1777. 



THE following sheets were originally printed as a text-book 

 for the use of students of medicine in the University of Edin- 

 burgh : it of course contains only sketches of what was more 

 fully delivered in the Professor's lectures. Though the impres- 

 sion formerly made has been long ago disposed of, the author 

 did not choose to renew it till he should be at leisure to give it 

 to the public in a more complete form. But Dr. Gregory, who 

 now teaches this branch of medicine, thinking those sketches 

 might be useful to his students, the author has consented to the 

 republication ; and it is now offered to the public in a more 

 correct manner. 



