] 
cavity; at leafl:, the brown yellowlfh tinge of the face, 
is a common iymptom in thefe obftrudions ; but in 
this cafe it appears to have been owing to the want 
of one of the pulmonary lobes, the other not being 
alone fufiicient to work the blood, and give it the 
necelTary rednefs. 
Short and imperfefl as this relation Is, I hope, 
neverthelefs, that it will prove fufficient to convince 
the Royal Society of the great regard, which I, with 
juftice, have for fo ufeful and praife-worthy an in- 
ftitution. 
XII. An Account of a New Improvement of 
the Portable Barometer. By Edward Spry, 
M. D. of Totnefs, Devon. In a Letter 
to the Right Hoi^ourable James Earl of 
Morton, P ref dent of the Royal 'Society^ 
My Lord, 
Read Feb. 28,r-j^ H I S barometer of my invention, 
conftrudion, I prefume, will 
anfwer every intention of the ufual, and more com- 
plex portable one, and in a much more fimple 
and durable manner, viz. The double round at the 
bottom makes it dijEHcult (even if we endeavour 
thereto) to caufe an afcent of air, or a fall of mer- 
cury into the bowl ; which, if the latter circumflance 
were to attend it, the quickfilver, from the bowl's 
conflrudion, muft remain therein, thence of no in- 
M 2 conve- 
