THE modified form of the ionic deflexion theory of wave propagation, discussed by Messrs. Nichols and Schelling (NATURE, March 7, vol. 115, p. 334), appears to have been suggested in England and ...

Sound spreads both forwards and backward in a space, meaning someone standing ... for the same to be done with ...

In the vast expanse of space, electromagnetic waves serve ... which influences their generation and propagation. These waves are typically observed in Earth's near-planetary region, where strong ...