water vapour

Of these causes of heating, the discharges in air or water vapour are probably the more important.

A double falciform ejection of water vapour from under the kettlelid at both sides simultaneously.

They vary much with the condition of the air as to dust, clouds, water vapour, &c.

Still, any rainfall map of Europe indicates clearly enough the origin of the water-vapour to which the rainfall is due.

After this, I recollect that there was a great envelope of water-vapour condensed around the planet.