am 

 ;ribcfl. 



IMPROVED. 53 



out of the Heart. It lies in the DupUcature or 

 Doubling of the AW/^y?/>K^, which is a doable Mediafli- 

 Membrane, formed by the Continuation of the Fleu- f}" 

 ra or inner Lining of the Ribs, which arifes at the 

 SternuM or Breaft-Bone, and goes ftraight down, thro' 

 the Middle of the Thorax or Cavity of the Bread, 

 to the Vertehvcv or Bones of the Back. I fay, tJ\is 

 Membrane ( which Nature has fo wifely formed to 

 divide the Tbcrax, to the End that when one Lobe 

 of the Lung£ is hurt by a Wound, the other Lobe 

 or Part of them nay officiate,) contains in its Doul - 

 lings, the Heart in its Pericardium, the Vena Cwva 

 or holl'^w Vein* tht? Oshph^fuf or GviHet, and ths 

 Stomachic Ner'ves. The Ufe of the Pericardium is 

 to contain a fmall Quantity of a clear watery Lymph, 

 which is feparated by fmall Glands in it, that tlie 

 Surface of the Heart may not grow dry by its con- 

 tinual Motion. 



This wonderful Engine is fituated in the Middle 

 of the Thorax or Cavity of the Breaft, between the 

 two Lobes of the Lungs ; it is of a Conic Figure, 

 whofe Bafis is the upper End or towards the Horfe's 

 Head, and its Jpex or Point, the lower End as ^'e 

 call it, v/hich is turned a little to the left Side, that 

 the right Auricle ( or Ear of the right Ventricle ) 

 may be a little lower than the left, by which Means 

 the refluent Blood in the Cava afcends the more 

 eafily in Human Bodies ; but in Horfes the Point of 

 the Heart is not turned fo much to the left, by rea- 

 fon the returning Blood brought by the Fena Ca^ja 

 to the Heart does not rife fo perpendicularly as in 

 Man. 



The Heart is tyM to the Mediajlinum and Peri- The Heart 

 cardium, both which I have defcribed, and fuftain'd dei'-^i^^''^- 

 by the great VefTels which bring and carry back the 

 Blood. It is cover'd by a Membrane or thin Skin, 

 which is of the fame Sort of that with which the 

 Mufcles are cover'd. Its Bafis or Bottom-Part is al- 

 ways furrounded with Fat. It has two Veins which 

 open into the Cwua or Hollow- Vein immediately be- 

 -. D 3 fore 



