VOL. XXIV.j PHILOSOPHICAL TRANSACTIONS. UQ 



covered with the prostatas klk; mn the two mucous bags on each side ; o the 

 bladder of urine ; p the musculus cremaster ; a the tunica vaginahs opened ; 

 R the vasa praeparantia cut from the great trunks ; ss the vas deferens on each 

 side; wxyz the left testicle, as in the preceding figure, with the opposite side 

 turned here; ee parts of the ureters; ** a probe inserted into part of the 

 urethra. 



Fig. 4 shows the forepart of the penis, as it appears when its corpora caver- 

 nosa are filled with mercury and dried ; ab its forked glans; cc the two distinct 

 apertures that appear in this distension or erection of its corpora cavernosa ; d 

 the middle part of the orifice of the urethra, which is occluded on the intu- 

 mescence or erection of the penis ; e the two veins of the glans, which are 

 compressed by the two sphincter muscles of the male and female in coition ; f 

 the bulbs of one of the cavernous bodies of the penis distended ; g one of the 

 bulbs of the cavernous body of the urethra also distended : these bulbi were 

 opened on the other side, ^, to fill the cavernous bodies with quicksilver, 

 but are all expressed as they ought to appear on both sides in the following 

 figure: h the urethra; i the muscles dried, expressed by ppffo in fig. 2 and 3; 

 Kk the veins tied up to keep in the mercury, as they pass the muscles of the 

 bulbi. 



Fig. 5 represents the backpart of the penis expressed in the preceding figure. 

 AB its forked glans ; ee parts of the veins arising from the glans ; fp the bulbs 

 of the cavernous bodies of the penis ; gg the two bulbs of the cavernous body 

 of the urethra ; h the urethra ; KKkk the veins tied up, as they pass out of the 

 bulbi to keep in the mercury. 



Tractatulus de Ambaro^ a Reverendo D. D. G. J. Camello, communicatus D, 

 Jacobo Petiverio Societatis Regice Socio. N° 29O, p. ISQl. 



Some observations on ambarum, i. e. ambergris ; concerning the nature and 

 origin of which see note at p. 94, vol. ii. of this Abridgment, where references 

 are given to more ample and accurate accounts of this substance. 



Concerning the Jesuits' Bark. By Dr. Wm. Oliver, F. R. S. N° 290, p. 1596. 



Peru bark comes frpm a tree about the size of a plum-tree, with leaves like 

 ivy, but not quite so large, which are always green. The Indians call it que- 

 rango. It is gathered in autumn, and the rind taken off all round, as well 

 from the trunk as boughs, which grows again in 4 months, as cork does. The 

 trunk is about the size of a man's thigh. It bears a fruit not unlike a chesnut. 



