Force, neceffary to give an oppofite New Motion. 
In this firft Book, he illuftrates all with Eighty 
Figures , contained in two compendionfly coarrived 
plates : And doth^ from their proper Principles, dc- 
monftratemriny of thefe thirds, which Writers com- 
monly Poftulate, or take for granted ; but which (to 
make a fure Foundation ) ought to have been de- 
raonftrated. 
1 1. NATHAN. HIGHMOKI de HTSTmiCA 
& HTPOCHONDRIACA FASSIONB.M' 
ponfto Ef iftolaris adDoB. Willis Med. Londi-^ 
nenjem. Londini, i6yo*in\^* 
THeoccafion of Writrng this Epiftle, was. That 
the Learned Dr. Willie in his Pathologia Cerebri 
undertakes to confute the Caufes of the Hyfterick 
and HypDchondriack Palllons, as they arealHgned 
by our Author in his Excrcitations^ concerning thefe 
two Symprons, piibliflied J//. 1660. Who thereupon 
thought himTclt obliged to write th^xs Defence^ in be- 
half of what he had foancrly delivered upon this 
Subjed. 
The Controverfie, as to the former of thefe Pafll- 
ons, confift3 in this. Whether, the caufe of it is to 
be referred more immediately to the Genm Nervofum^ 
and it be p/imarily a Convuliive Symptom^ (depending 
on the Brain, and the Nerves thereof, or whether \t 
ought to be imputed to the Bloody rufliing coo im^ 
peaiouily into and fluffing up the Lungs ? Hence 
. Dr. 
