CONTENTS. 



SECTION FIRST. 



I. Mineralogical and Chemical Account of the Yellow- 

 Springs, in the County of Chester, in Pennsylvania. Communi- ' 

 cated to the Editor by a Gentleman now on a Mineralogical Tour 

 through the United-States 207 



II. Facts and Observations concerning the supposed Effects of 

 the Vapour of Camphor applied to the Human Body. In a Letter 

 from Mr. Ephraim Eliot, to Dr. George C. Shattuck, of Boston, 

 and by him communicated to the Editor 216 



III. An Inquiry into the Chemical Character and Properties of 

 that Species of Coal lately discovered at Rhode-Island : together 

 with Observations on the useful Application of it to the Arts and 

 Manufactures of the Eastern States 22 1 



IV. An Account of a Complicated Fracture of the Trochanters, 

 in which they were completely broken from the Os Femoris. In 

 a Letter from William P. C. Barton, M. D., Resident Physician, 

 and Surgeon, of the Pennsylvania Hospital, to the Editor 236 



V. Facts and Observations relative to the Disease of Cynanche 

 Trachealis, or Croup. In a Letter to the Editor from Dr. Elisha 

 C. Dick, of Alexandria, Virginia 242 



