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ceives the blood of the veins, and at another it fends- 

 it out again, from an ahernate contradion and re- 

 laxation : the arteries corrt-fpond in this ; and this^ 

 forms what is calkd the pulfe. The pufie in the hone 

 beats about forty or forty-five tinx^s in a minute : in 

 a dog it beats eighty, ninety, or one hundred ; for a 

 fraall animal has more irritability, and is weaker^- 

 than a large one ; and hence what the heart wants in 

 ftrength it makes up in quicknefs : for which reafon, 

 young animals, as being weaker, have always a quick 

 pulfe; and thus a quick pulfe without fulnefs is a 

 mark of weaknefs. When the heart is Itimukted 

 to ad by fome particular caufe with great force, the 

 pulfe is then full : if this arifes from fome difeafed 

 caufe, the animal is then faid to have fever. 



The blood is the life of the machine, for it nou- 

 rishes and forms every part ; and this it does either 

 by depofiting its parts at once by its veffeis, or 

 through the medium of glands : but in whatever way 

 it is done, it is called fecretion. A s;!afid is a larj^^ 

 mafs formed of an al?emblage of arteries, veins, and 

 excretory veiTels, feparating the fecreted fluid, and* 

 carrying it off. The lirer [vide gg^^ fi-ontifpiece] i^ 

 a gland to fecrete the bile ; and it is remarkable of' 

 &fe gland in the horfe, that the bile is not kept itf 

 a refervoir called the gall bladder, as ia other afti- 

 raals, but pafl'es at once into the inteftmes- as it is- 

 formed. The bile is the natural purge of the ioief- 

 tines ; and, as we have already ihewn that a horfe is 



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