406 



THE UNIVERSE. 



circulation raises a weight fourteen times greater than 

 does that of the largest mammals.^ 



224. Force of Vegetable Circulation aod Abaoiirtion. Hales' experiment, modified, as 

 shown at the Amphitheatre of Rouen. 



'The experiments as to the force with which the blood is driven in the large 

 arterial vessels of animals were principally made by Hales, Sauvages, Magendie, 

 and Messrs. Poiseuille and Valentin. They were made on oxen, horses, sheep, 

 cats, and dogs. In all these animals the blood on an average raised a column of 

 mercury 15 centimetres (about 5 inches 9 lines), equivalent to lifting a column 

 of water about 2 metres (6 feet 6| inches). There is no reason to doubt that the 

 force is equal in man.— Beclard, Physiologie Humaiiie. Paris, 1866, p. 236. 



