( 499 ) 
tiring under u$, that was to be taken up. And by the 
return of the Air-Barrels, I often fent up Orders, written 
with an Iron Pen on fmall Plates of Lead, dire&ing how 
to move us from Place to Place as occafion required. Ac 
other times when the Water was troubled and thick, it 
would be dark as Night below ; but in fuch Cale, l have 
been able to keep a Candle burning in the Bell as long as 
I pleas’d, notwithflanding the great expence of Airrequi- 
fite to maintain Flame- 
This I take to be an Invention applicable to various 
Ufes; fucii as Filing for Pearl, Diving for Coral, 
Spunges and the like, in far greater Depths than has hi- 
therto been thought poflibie. Alfo for the fitting and 
plaining of the Foundations of Moles, Bridges, &€• 
upon Rocky Bottoms ; and for the cleaning and fcrub- 
bing of Ships Bottoms when foul, in calm Weather at 
Sea. But as I have no experience of the r e matters, I 
leave them to thofe that pleafe to try. I Ihall only inti- 
mate, that by an additional Contrivance, I have found it 
not impracticable for a Diver to go out of out Engine, 
to a good diftance from it, the Air being conveyed to 
him with a continued Stream by fmall flexible Pipes ; 
which Pipes may ferve as a Clew to dire# him back again, 
when he would return to the Bell. But of thir perhaps 
more hereafter. 
VIII. ObferVations on the Glands in the Human 
Spleen $ and on a FraSiure in the upper part of the 
Thigh-bone^ !By J. Douglafs, M.D. and R. $. S. 
/ nrT3at Anatomy, as well as Phyfick and Surgery, has 
received much improvement from a careful and 
true obfervation of what was found in the DifleCtion of 
. : ' morbid 1 
