(seq. 51)

[*chap. 8th in upper left hand corner*] Naturall Phylosophy [*43 in upper right hand corner*]

Mercury in ye pipe as will [aquipoize?] ye like pillar throughout
the whole atmosphere. this weight of ye atmosphere varies in sever-
-all times and places, therefore ye Cylinder of mercury in ye pipe
is shorter on the top of an high mountain than in ye valley: bec-
-cause ye like Cylinder of ye atmosphere is Longer in ye whole per-
-pendicular line's height of ye mountain, and therefore must we-
-igh more, and have more [sigil of Mercury] in ye pipe to counterpoise it.

Dr. Power (page 104) note {that} Pascalius in a mountain of 500
perch high found ye Difference 3 iches; whence he suggests {that}
by ye rule of proportion, we may find out ye height of ye atmos-
-phere; thus, heigh in ye tube 3 inches, height of ye hill 500
perch; height in the tube 29 inches, heigh of ye atmosphere
4833 perches ie: 15 1/2 miles.

It varies also in the same place so as ye atmosphere presses
upon ye [sigil of Mercury] in ye cylinder more or less in ye compass of about 6
inches. according as ye steams are more or less ascending & desce-
-nding in ye air. and thus are made Barometers, [sigil of Mercury], weather = glasses
now of common use.

[2] aptness yea necessity for breathing is ascribed to ye atmosphere
and its colder parts; for pure air is unapt for Respiration (as
is before noted) this is a perpetuall ambient Ingredent into our
bodies and is allways mixing with our Animal Spirits, not only
(though cheifly) by breathing, but permeating ye pores of ye whole
body and from hence ariseth ye Distinctions wholsome and unwhol-
-some; sweet and corrupted air, for it be Impregnated with
benign and [Calsamick?] particles, it cherisheth, maintains, & restores
health: but if (on the other hand) ye steams are [fatid?] and poyson-
-ous or otherwise malign, they destory ye health and endanger the
life. hence fires in ye streets of a city, shooting of great guns,
ringing of bells, are accounted profitable in ye time of pestilence.
as also ye naturall helps of frost, wind, rains, [?]: bec: these in some
measure beat down and dissipate those misamass or corrupted vene-
-mous steams that hover in ye air. hence our care is (or should be)
to mind well ye place of our habitations or settlements, that if air
thereof be suitable to our bodies by its agreeable steams. hence
also 'tis that some persons in chronicall Distempers, are for their
health sent to their native air, that is to ye steams {that} former-
-ly agreed with them

[text in the middle with a single bracket on the left hand side]
Respective attributes are greater weight,
usefull for Respiration when 'tis right.