The shattered state of most summits of mountains in these regions* has often struck me, many of them being mere heaps of rocks and stones, over which it is extremely difficult to climb. Mount Skyring may be cited as one remarkable instance; there, the stones gave out a very sulphureous smell when struck together, and were strongly magnetic. Lightning, electricity, and magnetism being intimately related, one is led to think that, if the above conjecture is incorrect, there may be some connexion between these sudden glimpses of faint light and the transmission of the electric fluid. This much I am certain of, that they were not lights made by man, and that they were different from the will-o'-the-wisp, or ignis fatuus.
* Falklands and Tierra del Fuego.