Page:Reflections upon ancient and modern learning (IA b3032449x).pdf/273

 stood none of the Viscera, to any tolerable Degree. (2.) One may perceive that every new Discovery strengthens what went before; otherwise the World would soon have heard of it, and the erroneous Theories of such Pretenders to new Things would have been exploded and forgotten, unless by here and there a curious Man, that pleases himself with reading Obsolete Books. Nullius in verba is not only the Motto of the ROYAL SOCIETY, but a received Principle among all the Philosophers of the present Age: And therefore, when once any new Discoveries have been examined, and received, we have more Reason to acquiesce in them, than there was formerly. This is evident in the Circulation of the Blood: Several Veins and Arteries have been found, at least, more exactly traced, since, than they were in Dr. Harvey's Time. Not one of these Discoveries has ever shown a single Instance of any Artery going to, or of any Vein coming from the Heart. Ligatures have been made of infinite Numbers of Vessels; and the Course of all the Animal Juices, in all manner of living Creatures, has thereby been made visible to the naked Eye; and yet not one of these has ever weakned Dr. Harvey's Doctrine. The Plea-