পাতা:পদার্থবিদ্যাসার.djvu/৮৭

7ፀ DIALOGUE V.- Continued.) Pup. i should now be glad if you w ould give me a clear idea of those parts of the body which are not visible te the eye; I mean. internal parts. Thf. The principal internal parts, are first, the stomach, a wide paunch, in which the food, that has been rhew ed in the 111tonth. is dissolvet! : 4 o facilifate the thissolution of which, it receives in its progress a liquor from the gall-bladder. The next things observ a!ie ::re {{te bow efs. Which receive the fo9i from the stotnach. pash forward the sofier parts. and absorb all the fine juices, by means of numerous absorbent vessets callied acteals, wiyich are islated in the bowels, and art of curious construction. The howels, which are nearly this ty feet long, by their variens soleisug". Lake tip but a stuali coni pass. Pitp. 1 Jow, oi iia w hat mauri* t . is the hody nonrisii+d by :oori ? Tut. The time juices, eail, d chyle, are convoy, d by means of the thoracic duct, to the hears, to b formed in to ileoni. Pup. IIow is all this werk effected ? Tat. The hears receives these juices, and injects them into the lungs, and the Hungs prepare them. The air drawn in by the kings, passing through the wind-pipe, carries off the inflammable parts in the act of breathing, and the lungs return the juices back to the heart; and they are thus converted into good blood, which nourishes the whole body. Pop. What gives the blood its motion or circulation ? *。 Tut. In that lies the grand secret termed life. The heart has a power of opening and of closing its cavities, which we call its expansion or contraction :