( 8ip ) 
divided into Minittes and halves, which will be fo mag- 
nified by the Eye Glafs. that it wjUbe cafy to diftingjuiJb 
the time to a few ftcodds. : 
muft confefs tiiere is fome-dificuky in fixing up this 
Inftrument.aTid when it is fo,to keep it from varying from 
its true pofition, yet 'tis not infuperable ^ but for fmall 
ioftruments ot aoout 2 or g foot Jong, there can;not be, I 
think, a more aCGurate, facile, and expeditious way than 
this for ; the drawing a Meridian, Line. Now whether 
the many benefits that may. accrue to Aftronomy, do not 
make the larger one worthy of the charge and trouble 
that there may be in corapleating it, I ftiali leave, Sir, 
to yours and the reft of the Illuftrious Society's confide- 
ration 5 to whofe fervice I am moft humbly devoted. 
Stephen Gray, 
VI. A Letter from Dr iMartin Lifter, F. i?. S. 
to Dr Tancred Robinfon, F. S. concerning 
jiouderd Blues faffing the laSleal Veins, 6cc, 
^j-!^- "Leather head. May 2. 1 701. 
WHen I was the other day in Town, I was fliewa 
by you a moft ingenious little Trad of Fevers- : 
which I read over with delight. I confefs, for want 
^of Mathematicks, I could not well enter into fome of 
his reafonings. However, in the main, as far as I could 
^be judge, he is much in the right, that moft, if not all 
Fevers proceed from the obftruftion of the Glands, 
But the occafion of my writing this Letter to you, is 
the paragraph I met with page 54 of that Book ; in 
^Vhkh an experiment of mine (very many years ago pub- 
lift]. 
