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Rumford's views respecting frigorific rays have not been generally accepted, and Prevost's theory of exchanges completely explains the apparent radiation of cold without supposing that cold is anything else than the mere absence of heat.

The following is the substance of his remarks on this subject:— "Forests act as frigorific causes in three ways: "1.

It is the chilling influence of the ethereal stream which originated the idea among philosophers, of frigorific impressions, darted from a clear sky.

Upon substituting balls of snow for heated bodies, they even went so far as to prove that frigorific foci may be formed by way of reflection.

When Verezzi's senses are "chilled with the frigorific torpidity of despair," his eyes "roll horribly in their sockets."