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Show 832 Of fRe/pimtion. Book ll. 15 this Digitir Cubicir aerir (7 walk auc'iiz thoracir requalz'r p399, Digiri: Cubicir, (9» lmjur radix Cubzwefl 1550; Ergo mtrrfia aem n/pzratz "'f'f fliametrum mei tbomrir mm ampliur, quam mm qumquagefima parte craflirm '1 S iriti. , m"\l\7lijeieiipon he addeth the motion of the Breal't to be oblcure 1n Infpiration, by reafon a fmall elevation of'the Srernon toward the Neck can only be difcerned, and the Abdomen being opened, the Midrifl may be. difcovered to be broughtfrom a Concave Surface to a Plain in a gentle lnlpii‘allOfl, becaufe in a violent one the Thorax is more dilated, as receivmg a double proportion of Air, more than is admitted in a quiet breathing. The great dilliculty is yet unfolved, how the Air is immitted through the greater and leller Channels into the fpongy compage of the Lungs, making its Diaftole in lnfpiration. Some conceive that Air being a fluid body. hath The-ambient a power to protrude one part after another; fo that the ambient Air is forced fniilihlcuiiiiis throughthe NOlel‘ilS or l\/Ionth into the Afiicra Arteria, and fnialler Pipes, into 312275322 the ( irbicular Tunicles, and thereby raifeththe body of the Lungs, by rea- iiiiigiiiiiitn fon the Air by virttie ol the weight of the luperincumbent Atmofphatre doth i ' not only rulh into the empty lpaces of Pipes, butPrrongly prelleth through the neighbouring parts endued with round concave Surfaces, receptive of this movable body of Air; which is continued from the Circumference of the Body to the greater and firialler Tubes and Orbicular Simo‘; So that the motion of Air is favoured by the infides of the Thorax (which before did refill the preilure of Air by comprellion ) as dilated by the Intercoflzal Mufcles, whencea freedom is given to the motion of the ambient Air prefled for~ ward by the weight of the Atmofphatre into the Cavities of the numerous Pipes, relating to the Lungs Thcflrufliire The liriiéture of the Lungs much contributeth to the motion of this fluid :idiiiigii'ii: Body, as it is compofed of greater and lefs Tubes leading into appendant Or:2:‘j;;:,{"' hicular Sinur, affixed to the fides of the Brancbia, whereby the Air hath 2: free accefs into tlirle niimcrousl'ipes and Simu, enlarging the bulk of the Lungs in their Dialiole. The Elafliclt And not only the preflure of the Atmofphxre, but the elafiick force of the forte rii Art iiiiiiiiinml Air, as havmginclinationsimmenfely to extend it fell, do much promotethe thctungi inflation of the various Cylinders and Orbicular TllnlchS‘, by reafon the power, by which the compreiled Air doth endeavour to expand it felf, is equal to the prellnre of the Atmofpha‘re, which being more intenfe or re- mili', doth impart greater or lefs Elafticity to the Air ', So that its Elaflick power ( as [humbly conceive ) doth arife from hence, That the nearer it is tothe Globe of Earth, it is the more compreffed by the weight of the fupfl‘ incumbent Air, whereupon it groweth more Elaltick as it hath a natural endeavour to dilate it felf to take oil its confinement, caufed by many fuperior Columns of Air idling upon its ambient parts, encircling the Earth; and when the ambient Air nearthis Globe is comprefled by the weight of its innumerable parts leaning upon its lowelt region, it hath a natural pronchfs to free it fclf from prelliire, by exPanding it felf with a motion of refiifll‘ tion:1 as it may be made evident bya known Experiment, mid. if a. Bladdcf having the greatell part of Air taken outof it by comprefling, and afterward a lltongcr l igature being made iii the Neck, and then the Bladder be placed in the Glafs, ( out of which the Air is afterward drawn out) whereupon the Bladder will prefently fwell, and be highly blown up, which is pleafant to behold, by reafon the Air, though very little, is confined within the Bladder, and the external Air (by whole preilure it was brought into a narrow compafS) Book ll. 0f Refpimtion. compafi?) being Withdrawn, doth immediatel y dilate it felf, and blow it the Bladder: Alter this manner it may be conceived that the inflation of the lungs is accompliihed7 becaufe as foon as the fides of the Thorax ( Which comprCfS the Lungs in their contract ion) are drawn upward and outw , ‘ ' ard , . the ambient Air, confining on the entrance A r p of the Wind-pipe, is impelled bytht' preilure of the A tmofphaere, and by its own Elaliic k power into the greater and lcller Pipes, and round Simi: of the Lun s Wliereb th immediately diliended. g' Y ey grow Learned Dr. Mayan), doth illulirate the inflation of the Lungs in Infpiration by another Experiment, in which a Bladder, being included within Dr. Mayor-'5 Experieintnt about the in- the cavity of the Bellows, with this contrivance, that the neck of the Blad- ""3"" 0‘ m der may be fo faltned to the infide of its nofel, that the Air received by it Lungi. be immitted irfto the body of the Bladder ; So that the Bellow s being opened, the Air will immedi ately rulh into the Bladder, lodged in the body of thd BellOWS, Which the Ingenious Author concei veth to rcfemble the dillention of [he Lungs in their Diafiole, as it may be read in his Treatife of Refpi- ration, p. 274. Snpponaizzw ergo Vefiram in mediate F0/113 inc/iifdm, eju/E/emq; col/um roflrv Fol/it flbi Indira, ita dflixnm cfle, ut aerrqflr‘o ti i/Iflalur, mm iii/i in 7/6101"! diélam mmflre poflit, ut ante"! il/fld fiat, wejim ifld rofl'ro Fol/it ea moclo adapmzzda efl, cum Follir i/le riomlnm compag inamr : Porro foramen, illud 710W tron, iiti aflolct, in inferior: lamina Fol/is, fed in flipcriorejam, idqucfizti}: amplimz exrudamr; idrmq', szilro ope mmenti idimei laminae ei afii‘xo flriélim obliireiur ; qiio wefim illiuJ‘ intlufa, per witrum iflar, tar/qua»: per feneflram (071 pici poflit, Hi4" ad bunt mod/rm paratir, fi Fill/i; if}: aperiatnr, illim lamiIms abinoi rcm diducemlv, wrficam diiflam inmmcfrm', 2'7» in cavita tem Follir ampliatam exrmdi percipier 5 (7» quidem trident plane ratione Pulmonnm inflatio in peéiore dilataio cflicitur. Both thefe EXperiments, the one being performed by the reception of Air into a Bladder (placed in a Glafs ) and the other in BCIIOWS, do feem to prove the motion of the Air into the A/pera Arterirz, and its Branch es, (divaricated through the body of the Lungs) made by the preilure of the At- mofphatre, and the elalliclt parts of Air. Some Learned Anatomills have this fentiment, That the inflation of the Lungs in lnfpiration is not performed wholly by the cumbent Air, but by the attraétion of it through weight of the fuperinthe Noftrils or Mouth in~ t0 the \Nind-pipe and its fmaller Tubes, and their appendant Sinm‘, after the manner of fucking Water through a Pipe or Oiiill into it 5 whereupon one extremity of the Pipe being putinto the Mouth , and the other into Water the ambient Air is Wholly fecluded from its accefs to the Pipe, which Some Learned Anammiihi iudg the Mir tion of the Lung: to be made by the fucking ofAir. cauferli the Water, by the power of the breath drawn inward , to afcend throug h the Pipeinto the Mouth, to preferve the Oeconomy yacmty which would enfue, when the Air, lodged of Nature by avoiding a in the cavity $5 gradually exhaulied, if (hC Water did not rife up by ngrces, ofandthe Pipe, fupply its Placein the Pipe. After this manner .it may feem the Air is drawn into the The inflation md-pipe, and its finaller Branches lodged in the Lungs, of the Lung: to prevent a V4- with Air, in ("m") When the Perimeter of the Thorax is enlarged by the motion of the "'"dmi‘rc‘ Intercol'talMui'cles, bringing the Ribs upwa vent 3 Vacuum rd and outward from obtufe to mincsr can. fomcwhat rightAngles, and by the contr aétion of the Midrifl‘, pulling it dOWHWard from aCon cave Surface to a Circular Plain 3 whereupo n the dimmlions of the Breafi being rendred much greater in length by the depreflion 0f the Diaphragm, as well as in breadth by the pulling the Ribs outward, a "0m"! mult immediately follow, if the diftended Lungs did not at the lime moment |
