Emission of Volcanic Gases

Abstract

I TOO have been shown the effect described by Prof. Conway in NATURE of June 21, p. 891, at the Solfatara, near Naples. I was inclined to believe in its objective reality, but was not sure. I write to suggest that some scientific man who is taking his holiday in that neighbourhood should carry a camera with him, and obtain a photograph before, and another after, the torch has been applied to the vent. In that way I think it would be easy to decide objectively whether the distant vents are affected or not.