.[ 20 ] . 
fluid, which contain the rudiments of every 
part, will be wanting. It may indeed be faid, there 
are hydrocephali that have all the organs very well 
formed: but there the difeafe has commenced after 
the perfedt formation of thefe parts, whereas if you 
fuppofe it to have happened in the very time of that 
formation, you will fee that the nervous juice, vitiated, 
diluted, and turned out of its natural courfe, can no 
longer be employed in the generation of thofe or- 
gans. 
Thofe who have attended my courfes, and have 
read my phyfiology, will be pleafed to fee that all 
thefe myfleries, which one would have thought im- 
penetrable, are eafily accounted for upon the princi- 
ples I have laid down. 
II. A Later 
