ingifl them the Spirits 5 others making them the receptacles of 
the Excremeats of the Brain - and boc|i perplext in affigoiag 
the fcurceandlflTaeofthe Excremints, and the SpiricSjand the 
manner of the prod adioD of the latter, 
BefidesthiSjhe finds a greatdcfecS in the way of diffe(aing 
the B ain 5 and having fliewed the impsrfedioa in che common 
ways , hepropofes and recommends that C thoughdifficult one) 
of contiQuiog the filaments or threds of the Nerves through the 
SiabftiRceofthe Brain, to fee 5 where they pafs, and where 
chey terminate. 
. . "h^ XC5 he entertains the Reader with an Enumeration of the 
chief J^rwj of Aaatomifts touching the br no. And here he ex- 
amins particularly the Syftemes of Dr. Willis and Monfiear Bcs- 
Cartes. la th^ former he rakes fpecial notice , that the Author 
thereof lodges th€: Common scnfe in th^ corpus Striatumt,&Q Imagi- 
mtion in the Corftds Calhfum-^mi the Memorj in the Grayifh Sub- 
fiance which encompaffts the white. But then he declares, that 
thefe affertioos are very obnojcious 5 forjWhereas Dr. Willis def- 
crib-S that Corf us (triatum^ as if there mere two fots of Streaks 
- T'^-ys', fomeafcendiag J fome defcending, he finds, that a 
reparation biag made of the Grdyhody bom tht White ^ thofe 
Rays will be found t3 be all of the fime nature 5 thar is, they 
make part of the White fubftince of thtCorpmCdllofum which 
paflTes towards the Mirrow of the Back, feparated in divers 
Layers by the intervening ofthe Gr^)'//&Sabftance, Which 
being fo 5 [aithhe^ with whit certainty can we be made to be- 
lieve, that thofe th 62 Oparat'ons are performed in thofe three 
Bodies:' And who can tell us, whether the oervcm Fibres have 
their beginning in the Streaked Eodj , or whether they rather 
pafs through rbe Callous Body intoihQ Gray Suhflance^ 
l^lht Utter oiM, Bes Cartes ^ he finds, that that Philo- 
fopher hath rather ^ci;//^^, in his Treatife of Man^ fjch an En- 
gine, chat psrrorms ail the a'^ions. Men are capable of^ than 
defcribed Mifs, z% really htlst^ which he underttkech to p.ove 
by div.rs inftmceSj taken irom the C^r?^^//^;? fibrick of the 
p^rts of the Brain: in the doing of which our Author (hawe^s 
great dexterity^ skill, and accurateaes. And from hence he 
V proceeds , 
E eeee 2 To 
