VOL. XIII.] PHILOSOPHICAL TRANSACTIONS. 575 



(fig. X, b) itself in the repository of the Royal Society, very curiously prepared by 

 that ingenious young gentleman Richard Waller, Esq. a worthy member of the 

 society ; whose great assistance to me I must here gratefully acknowledge, as 

 to the designs, and otherwise ; his curious pencil illustrating what my pen was 

 often less able to describe. 



The Explanation of the Figures. 



Fig. 1 . represents that part of the body opened, which contains the lungs, 

 the heart, the gullet, stomach, &c. — aaa The arteria aspera, or windpipe; B 

 the upper part of the lungs, which is vesiculous; ccccc the lower part of the 

 lungs, which makes a large bladder; d the first swelling oesophagus, or false 

 stomach; eee the oesophagus or gullet, and that part of it where it is straighter; 

 f the second swelling of the oesophagus, or second false stomach ; g the tnie 

 stomach ; h a short straightening of the gut, a little below the pylorus ; i the 

 intestines; k the heart; 1 the auricle; mmm three arteries, whereof there are 

 two ascending and one descending; nnn three large veins, whereof two are de- 

 scending and the third ascending, which last seems to divide the liver into 

 two lobes; oo the liver; p the gall-bladder; q the spleen, as it is called by the 

 ancients, but by Charas the pancreas; rrr a large blood-vessel that runs in the 

 midst of the scales of the belly; ss the muscles belonging to the scales of the 

 belly. 



Fig. 2. shows those parts that are contained in the lower part of the body. — 

 a the intestines cut off just below the pylorus; b the gall-bladder; c the ductus 

 bilarius, that passes through the middle of the spleen, or as called by Charas, 

 the pancreas, and enters the large gut; d the spleen, or pancreas; ee the in- 

 testines which was very large and winding but short; f f the rectum; g the 

 anus; hh the testes; iiii the vasa deferentia; kk the penes on each side, which 

 first at the root are conjoined and are thick beset with bristles; 11 the muscles 

 that serve for drawing in the penes; mm the scent-bags; nn a large blood- 

 vessel that runs on one side of the left kidney; ooo the emulgents that arise 

 from the same; ppp the secretory vessels; qq the large blood-vessels of the 

 right kidney; rrr the emulgents arising from it; sss a round body of blood- 

 vessels; ttt secretory vessels; uu the ureters. 



Fig. 3. represents the penes of one side of a viper. — a the vas deferens, 

 which afterwards divides and runs to the end of the penes ; b the penes ; c the 

 muscles which retract the penes. 



Fig. 4. represents part of the lungs opened by the trachea. — a aaa the arteria 

 aspera, divided in the middle; bbb some larger branches of blood-vessels; ccc 

 the vesiculse, or cells of the lungs. 



