Text: "With the limitations imposed by Nature on our vision, which cannot perceive time periods of less than one-tenth of a second, and the relative crudity of light, the wave length of which is many molecular diameters, we are not and never shall be, able to follow the molecules or intermolecules by means of light waves, in their nature frequency of oscillation. The finest researching instruments now in existence will never be able to calculate the time periods of propagation and transmission of the sympathetic vibratory processes. Direct observation can never establish a foundation in this line of research, for independent of the impossibility, the results would also be unreliable."

See Also:

Source: 11