( 5 ‘ > 
more of their low Dofes, which is not conform to Na- 
ture for, let the low Dofe be what it will, the high Dofe 
of one Medicine muft always bear the fame proportion to 
the high Dofe of another, as did their low Dofes, viz* 
even in Manna, they reckon it from 5;.* commonly to jiij. 
and |iv. If it is faid that the fiift Dofe is the lowelt 
Dofe that is taken by a Man of a due Age, it is neither 
true in fadt nor conform to their own way of reckoning: 
For inftancc. Rhubarb is faid to be taken from 5}. to 
No body will fay that this is the loweft Dofe taken by a 
Man of a due Age as formerly ^ becaufe itis notin fact true, 
nor that the high natural Dofe is ?/> 5 for, as I faid be- 
fore, if ?j. of Manna and 5j, of Rhubarb are the refpe- 
dtive low Dofes, then |iv and ^ij.cannot be the refpedtive 
high Dofes. As to what concerns fome extraordinary 
Dofes given by thcmfelves, and far exceeding the ordina- 
ry Dofe, is eafily accounted for by the Solution. There 
are many Examples of this Nature: Turbith, ^2:.. is com- 
monly reckon’d among them from J). to 5 yet Marg» 
gravluf, and good Authors, have given it to ^iv. So Co^ 
locynthK from gr, vi. to gr. xi j. and Fulgin. Dhti- 
can, fay they have given it to 
III. Authors have been far from being exadi^ for they 7 ^^> 
have only dos’d thefe Medicines for People of full Age 
but have left the Dofes of the different Ages in filence 
nor have they told us at what time a Man takes his high-^X^. 
eft Dofe, or how that alters in the Growth and Decline 
of Age, which is ftill a very great diflSculty for the moft 
experienc'd Phyficians to manage. 
IV, Their general Method is founded in a Miftake • 
their loweft l 5 ofe being really the common Dole taken 
by the generality of Men, which produces a multitude ^ 
of Erfours in the Praftice. This is manifeft in their do- 
ling every Medicine. 
H 2 
V, The 
