1. I WAS interested to see the letter of Prof. A. S. Herschel, in NATURE, vol. xviii. p. 39, referring to my papers on the subject of the derivation of work from ...

Fargo, North Dakota, where the new normal is a tenth of a degree cooler than the old one, is an exception, but more than 90% of the U.S. has warmer normal temperatures now than 10 years ago ...