experimental evidence/results/data• Though the theory was many years ahead of its time it was almost wholly guesswork and rested on no satisfactorycontemporaryexperimental evidence.• What is needed is some basis for estimating the functional from a finite number of experimental results.• Weismann did offer some directexperimental evidence for the non-inheritance of acquiredcharacters, and a great deal more is available today.• However there is now an enormous amount of experimental evidence in favour of it.• However, some suggestiveexperimental evidence is now available.• Is the standard unifiedmodel the only possible explanation of the experimental data it so well describes?• Snow was involved in a whiff of controversy about some experimental resultsobtained in the 1930s.• Further, no firmexperimental evidence shows that these drugs diminishregionalcerebralbloodflow in migraineurs.