HEART. 
- taneous, cellular, and seers in all organs for the purpofe 
of nutrition ; retions are poured out only on 
mucous and cutaneous "Tasfacks. Hence, both in fecretion 
and exhalation, the capillary fyftem is mee Ss between 
~ the veffel that brings, and that which carries away ; but in 
the latter cafe there are capillaries on shill in the former 
there is an additional organ. In fhort, glands are pect 
to fecretion, and exhalation is serie without them 
Phyfiologifts have entertained very different notions on the 
ubjeét of exhalation. Boerhaave imagined fucceflively de- 
creafing veffels capable of admitting colourlefs fluids, but 
excluding the red globules. Thefe have been commonly 
more recent anatomifts, who have referred ex- 
fal Seco by the vital powe 
It muft be difficult to form BY clear notion of we 
3. from their extreme tenuity, conftantly elude our ob- 
fervation in their natural fkate ; and our opin nions shceefove 
ons s and 
rs. Exterior, opening on - #e 
pi aga tiffues. Nothing receives the inje&ted — 
ept the es ape and exhalants. In activ 
as proved, the following points, viz. that exhaling veffels 
exilt, that they arife in the capillaries end a by open 
orifices on their refpective furfaces. o further, and 
attempt to explain their length, form, duet: ind the nature 
of their orifices, our defcriptions will become purely ima 
t divides the exhalants into three claffes. The firft 
includes thole which feparate fluids to be thrown out of the 
economy, fuch as thofe of the fkin, forming the fweat ; thofe 
of the various mucous furfaces. o the Rane Aivifion be- 
fluids remaining for fome time on 
or in various — afterwards taken up by 
the abforbents and conveyed back again into the circulation. 
Such are the exhalants of ferous furfaces, which pour out 
fluids in order to lubricate the membranes and facilitate the 
motions of the organs covered by them; the cellular ex. 
halants, which form the lymph and fat of ‘the cellular inter: 
ftices ; the medullary exhalants of the bones ; and the fyno- 
ae exhalants of the articular membranes, and of the burf 
wel 
ok 
5 
Serous*Auid.. 
at. 
Exhalants. <2. Interior, opening on 1. Of the fhort and flat bones, and ends 
3. Medullary fyftem. of the long bones. 
(2. Of the middle of the jong, hoaeé. 
- s iat 8 toons 1. Of the articulations, 
: : a Y z Of the tendons. 
3. Nutritive. Each organized 1 tiffue has its asi pal day 4 ‘ 
As the exhaling veflels enter fo effentially into the inti- 
mate component nbitance of each organ, they mutt differ 
in each organized tiffue, but thefe differences do not come 
under our obfervation 
Properties of the S: 
safle, —The veffels are too fine t 
admit of our analyiing tot eying which depen 
Fon 
their organization, We ven know whether thefe 
$ are enlarged when ee set the red globules, al- 
, ie been aflumed by the Boerhaavian fchool 
the 
he properties of cach f fy fem. 
the peculiar fluids 
Potelinla 
_ PWwater ig contained in the blood, itis dipoled of by the cv 
ioe of a Ae 
fat, nor. the s fluids re thenafe: of 
blood entering the capillaries is every where, &c.. 
iat 00, certain aie ve a greater tendency 
than others to admit the blood, an: it out on — 
— furfaces; as for ex of the mucouis. 
ample, thofe 
embranes ; and fome Sh thelr tore difpofed to o fuel kind 
Refpedtin exhalation occurs, and he: 
principle on which it pend we refer the reader to the 
article GLAND; as there is hitherto no means o diftinguifh- 
ing between this procefs and that of fecretion ; in truth we 
Site ignorant of the exaé nature of the procefs in. 
both ca: a 
When the vital properties of the exhaling veflels are mo-. 
dified by aifeafe, they pour out various matters different in 
their nature and properties from the natural flui One of 
the moft frequent i 
arly difpofed to this affeStion, fo that it a 
ic of that or organization. Inall fuch the 
eee is‘entire, and offers not the fighte trace of ul. 
ceration 
