Such verifications are of value for two reasons.
t i ce cannot himself undertake even the verifications required in the conduct of individual cases.
The standard treatise on the mathematical theory is Lord Rayleigh's Theory of Sound (2nd ed., 1894); this work also contains an account of experimental verifications.
at Paris, the first metrological institution, also undertakes verifications for purely scientific purposes.
Similar anticipations and verifications among the invertebrates have been made by Hyatt, Beecher, Jackson and others.