I. The TraBlce of Turning Vomiting MedichieSy 
according to Dr, Cockburn^^ Solution of his Dro^ 
Hem 5 with Tables JJ?ewing their Dofes in particu- 
hr Ages and Cofijlitutions, InJcriFd to the Learned 
■ Dr, Garth, F. 5^. S. by W. Cockburn, M. D* 
Thil. 7t 4»/-T3 Y my Solution of the Problem for determining the 
4^. iVo.303. jQ (iue Dofes ot Purging and Vomiting Medicines, in 
Pohi Cafes, it is manifeft in general, that thefe Medi- 
cines operate either upon the account of their being mix- 
Schol. ^d with the Blood, or by their ftimulating the Stomach 
and Guts : 2. That this their Operation is more or lefs 
j according to the Quantity and Thicknefs of Blood, h. e. 
a greater Quantity, and the thickeft Blood require the 
Trop',ii greateft Dofes : And 5, that when the Quantities of 
“ Blood are the fam^, the Dofes of Purging and Vomiting 
Medicines are in a duplicate proportion of the Bloods 
' thicknefs. As alfo, that in every cafe thefe Dofes muft 
Trop. 2. 2 proportion compounded of the Quantity of Blood 
and thofe Squares of its thicknefs. 
Now fince the Operations of Purgative and Vomitive 
Medicines depend fo much on the Quantity and Vifcidity 
Medicines fooi the Blood, which have not been duely confiderd be-. 
hard to he fore 3 it is no wonder that the Pradice of Phyfick in thefe 
foitnd. Evacuations has been fo uncertain, and that the rnoff ex- 
pert Phyficians, from their moft accurate Obfervations, 
could never determine the true Dofes of Medicines, which 
alter fo much according to the various Subjeds they work 
]upon 3 they not being acquainted with the true Method 
of determining either the quantity of the Blood, or the 
degrees of its thicknefs. 
Becaufe 
