Note 454 — Chapter VIII

It appears that in descending from Mont Blanc, Tyndall suffered severely from the heat, though he was knee-deep in the snow at the time. The Professor attributed this to the burning rays of the sun, but Pleasonton maintains that if the rays of the sun had been so intense as described, they would have melted the snow, which they did not; he concludes that the heat from which the Professor suffered came from his own body, and was due to the electrical action of sunlight upon his dark woolen clothes, which had become electrified positively by the heat of his body. The cold, dry ether of planetary space and the upper atmosphere of the earth became negatively electrified, and falling upon his warm body and clothes, positively electrified, evolved an increased heat (see “The Influence of the Blue Ray,” etc., pp. 39, 40, 41, etc.).