mi. ANA TOME MEDULLAE SPINALIS, 
E T NERVORUM inde frovenientium 3 
GERARDI B LAS II, i*. 
The Author fhews in this little T raff a way of taking the entire 
Medulla Spinalis , or Marrow of the Back* out of its Theca or 
Bony Receptacle, without Laceration ; which elfe happens fre- 
quently, both of the Nerves proceeding from it , and of the 
Coats invefting it 5 not to name other parts of the fame. This 
he affirms to have been put into pradice by himfelf, by a fine 
Saw and Wedge ; which are to be dexteroufly ufed ; and he pro- 
duced accordingly in excellent Cuts * the Reprefentations of the 
Structure of the faid Medulla thus taken out, and the Nerves , 
thence proceeding 5 and that of feveral Animals P Dogs, Swine, 
Sheep, 
He intermixes feverai Obfervarions , touching the Singknejs 
of this Medulla , againft Lindanus and others $ its Original 0 vid. 
Whether it be the Root of the Brain * or the Brain the Root ofit»° : 
ks difference of Softnefs and Hardnefs in feverai Animals; where 
he notes , that in Swine it is much fofter than in Dogs , &c,. 
He exhibits alfo the Arteries , Nerves 3 and Veins , difperfed 
through this Medulla , and inquires , Whether the Nerves pro- 
ceed from the Medulla it felf , or its Meninx ; and difcourfes 
alfo of the Principle and Distribution of the Nerves ; referring 
for ampler information in this and the other particulars , to 
that Excellent Book of the Learned Dr . Willis 0 ne Anatoms- : 
