 Near 1740, David Hume, in Scotland, identified multiple obstacles to inferring causality from experience.Hume noted the formal illogicality of enumerative induction—unrestricted generalization from particular instances to all instances, and stating a universal law—since humans observe sequences of sensory events, not cause and effect.Perceiving neither logical nor natural necessity or impossibility among events, humans tacitly postulate "uniformity of nature", unproved.