m The P R E F A C E. 
j^lfout to years fmcBj I made fever al hte- 
majiat teal Experiments on^ogSy and 6 years 
afterwards repeated the fame on Horfes and 
other Animals y in order to find out the real 
force of the blood in the Arteriesy fome of 
which are mentioned in the third chapter of 
this book : At which times I wifbed I could 
have made the like Experiment Sy to difeover 
the force of the Sap in Vegetables , but def 
paired of ever effecting ity till about [even 
years fince, by mere accident 1 hit upon it^ 
while 1 was endeavouring by fever al ways to 
flop the bleeding of an old flem of a VinCy which 
was cut too near the bleeding feafony which I 
feared might kill it : Having, after other means 
proved inejfdiualy tyed a piece of bladder over 
the tranfverfe cut of the Stemy I found the 
force of the Sap did greatly extend the bladder ; 
whence I co?k hided y that if a long glafs Tube 
were fixed therein the fame inannery as I had 
before done to the Arteries of fever al living 
Animals, 1 JJjonld thereby obtain the real of 
cendrng force of the Sap in that Stem, which 
fucceeded according to my expeblatioriy and 
hence it is, that I have been infenfibly led ony 
to make farther and farther refe arches by va- 
riety of Experiments, 
Ad 
