33 © Mr. ches ton’s Account of an 
of a principal part of the os innominatum, fo far as this 
could be afcertained by thrufting a probe into it in dif- 
ferent directions . 
The manner in which a portion of this tumor preffed 
on the neck of the bladder readily accounts for the dif- 
ficulty of palling the catheter, though a bougie ealily 
flipped in, and gives us a reafon why the patient was 
unable to empty his bladder for fo long a time before his 
death. 
The degreeof injury the os innominatum has fultained 
cannot yet be certified, the tumor not being fufficiently 
reduced by maceration. Where the bone is cleared from the 
furrounding foft parts, it appears to have fuffered a great 
lofs -of fubltance, and, as the tumor diffolves, a large 
quantity of bony matter now deprived of its connecting 
medium is continually fubfiding to the bottom of the 
veflel in which the tumor is macerating. 
The preparation of the thoracic duCt was at firft put 
up in fpirits to preferve its original appearance, and in 
this ftate I brought it with me to London. Upon fhew- 
ingit here to feveral anatomical gentlemen, they were in 
doubt whether there might not be yet remaining fome 
fmall cavity in the d-uCt, and were therefore defirous I 
fhould take the preparation out of the fpirits to be exa- 
mined more accurately. This I readily complied with, 
and 
