That if 'tis a rare chance to fiad its blood in the Veins of 
geafts J 'tis almoft impofiible not to find^ forae coiruption in 
that of Men, how healthfal foever they fcem to be. Yea, e- 
ven in Children yet fucking, it is not wholly unblamable* 
becaufe, having been nourifnt with the blood and milk of 
their Mothers, they have fuckt corruption together with their 
nourifliment. 
2. If Phyficians fo fuccefsfully employ the milk of certain 
AnimalSjto which they oblige certain Patients for fome whole 
years together : If we are very well nouriflit with the flefti of 
fome, during all oiir lives ^ and if their juices be fo advanta- 
geous to us for repairing our natural ftrength j Why may we 
not hope greater, advantages from the mixture of their blood 
with ours, 
3^. The Operation may be made more boldly, and with 
greater fuccefs by employing Brutes. For, being we defign 
tptakethebeft blood that is to be had, and leaft iubjeft toco* 
agulation, 'tis certain that the Arterial blood upon acount of 
its heat and tenuity, poffelfeth both thofc qualities in much 
•more perfection than the Venal. And the dangers and in- 
conveniencies which would occur in opening the Arteries 
of a man arenot confiderable, when 'tis a beaft on whom the 
Operation is made,, 
4. Beafts may be better fitted and prepar'd for this ufe than . 
men,For I fhould advife thofe, that would employ this Experi- 
ment to the beft advantagCjto feed their Beafts forlome daies 
before-hand with more care and exquifitenefs than ordinary : 
fince, if by the tafte we can difcern t^e flefli of Gatves fed for 
fome time, with Milk, and Yolks of Eggs to be much more 
pleafant than that of others ; reafon ought to perfw^de us that: 
their blood is alfo meliorated according to their feeding. 
All thefe Reafbns joyn'd to the Experiments we have made,\ 
could not but induce us r,o give affurance to the publick of the 
little danger to be fear'd, and the confiderable effed:$|to be ex- 
pe<Sbed from this Operation. Yea^ we imagin'd 'twere no rafli- 
nef$ to make tryal of itupon men, and indeed divers perfons . 
o£much gravity and prudence follicited us to beg fome con- 
demned Criminal^ on whom to make the firft Eflay . But ha** 
ving 
