40 MEMOIR OF CAMPER. 



lers state to be altogether surprising, and which Buf- 

 fon has clearly established. Sometimes I have my- 

 self noticed, that the orang-outang, when enraged, 

 titters hoarse and disagreeable sounds, and some- 

 times, again, peculiar plaintive cries, which, 1 be- 

 lieve, are produced by this singular apparatus." 



This peculiarity of the organ of voice is illustrated 

 by sketches and drawings made by the author him- 

 self at the moment, according to his invariable prac- 

 tice. Of the success and accuracy with which he 

 performed this part of his task, we are able to form 

 a tolerably accurate estimate, by the examination of 

 the folio volume of plates accompanying his works, 

 mostly prepared by himself, and executed from the 

 originals by the famous Vinkeles : it contains thirty* 

 four plates, and several hundred figures. The in- 

 valuable habit of minute accuracy of observation, 

 derived from his practice of drawing, is well illus- 

 trated by the following observation : " M. Alla- 

 niand," he says, " the illustrious Conservator of the 

 Public Museum at Leyden, having published his 

 work on the orang, sent me a copy of the plate 

 which accompanied it. Upon examination, I found 

 that he had distinctly delineated nails upon the great 

 toes, as did also Mr Edwards, the Librarian of the 

 London College of Physicians, in the work edited 

 by him. On my calling his attention to the fact, 

 M. Allamand immediately corrected his mistake ; 

 and I speedily learned from a friend in the British 

 Museum, that Mr Edwards had been alike incau- 



