1883 The Lancet  
602 THE GROWTH OF "THE LANCET.' infections could be artificially developed. Indeed, he found that if the exudation of a simple peritonitis were injected fresh into the peritoneum of another animal, the disease assumed a more intense form in the second than in the first; and, further, that if in this way the disease were communicated to several animals, and by artificial selection the most severe cases were picked out, a virus could at last be obtained of which the virulence resembled that of the
doi:10.1016/s0140-6736(02)32324-9 fatcat:o66vpzxrevdnrkqanug2bjydiq