There had been nothing quite like this in medical literature since the Hippocratic treatise, "On Airs, Waters and Places"; and there are probably some germs of truth in it still undeveloped, although the modern science of epidemiology has introduced a whole new set of considerations. Among other things Sydenham is credited with the first diagnosis of scarlatina and with the modern definition, of chorea (in "Sched. monit."). After smallpox, the diseases to which he refers most are hysteria and gout, his description of the latter (from the symptoms in his own person) being one of the classical pieces of medical writing. While Sydenham's natural history method has doubtless been the chief ground of his great posthumous fame, there can be no question that another reason for the admiration of posterity was that which is indicated by RG Latham, when he says, "I believe that the moral element of a liberal and candid spirit went hand in hand with the intellectual qualifications of observation, analysis and comparison."