VI. On the behaviour of supersaturated saline solutions when exposed to the open air

It is a remarkable proof of the difference between the air of a room and that of a field or garden in the country, that supersaturated saline solutions, which crystallize the moment they are uncovered in a room, may be kept uncovered in an open space during many hours without crystallizing. During the last three years I have made many experiments to confirm this conclusion in the little garden at the back of my house at Highgate. I have no doubt that in a more open space further in the country the results would have been more perfect; but still I venture to think they are sufficiently striking to merit a place in the 'Proceedings.' The following were conducted during the spring of the present year.