Essays on Several Parts of the Animal Oeconomy
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1717. Excerpt: ... ly be determined: For suppose the More...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1717. Excerpt: ... ly be determined: For suppose the Bladder 3Feetfrom theGround, and that it throws out the Urine in a horizontal Direction 6Feet: Then the Height from which it must fall to acquire the Velocity by which it is thrown out from the Bladder, will be 3 Feet, and this Height doubled is the Length of a Cylinder, whose Base is equal to a transverse Section of the Urethra, (the Diameter of which Section I take to be about parts of an Inch) and whose Weight is the Force of the Bladder. Now the Weight of such a Cylinder will be found to be near 3 Ounces, which is therefore the Force of the Bladder in throwing the Urine 6 Feet forwards. BoreU't required a Force in the Heart equal to the pressure of 180000 hb. weight, to moveio/; weight of Blood, whereas from what has' been demonstrated, a G 4 bove bove 100 lib. weight of Blood may be moved by a Force in the Heart which does not exceed the pressure of one Pound at most. This may to some seem very strange at first sight j but is we consider the Case attentively, this Force in the Heart will be found sufficient for all that is required of it. It is not indeed requisite that the Force of the Heart should be able to move 100 lib. of Blood at rest; but this Blood being once moved, . the Force of the Heart must be siich as will preserve the Motion at first communicated to the Blood: How the Blood came first by its Motion, is not my present Enquiry, that I leave to be determined by the occult Philosophers: However this is certain, that if the resistance of. the Blood bore always the fame Proportion to the Force of the Heart that it does now, that the Blood never could at first be put in Motion by the Heart. 'Now did the Blood constantly move forwards, with the Motion at first communicated to it, and did the Coats-of the Vessel..