[3 bis] P. Chigeffsky showed in 1884 (at Geneva) that in the evaporation of saline solutions many salts are carried off by the vapour--for instance, if a solution of potash containing about 17-20 grams of K_{2}CO_{3} per litre be boiled, about 5 milligrams of salt are carried off for every litre of water evaporated. With Li_{2}CO_{3} the amount of salt carried over is infinitesimal, and with Na_{2}CO_{3} it is half that given by K_{2}CO_{3}. The volatilisation of B_{2}O_{3} under these circumstances is incomparably greater--for instance, when a solution containing 14 grams of B_{2}O_{3} per litre is boiled, every litre of water evaporated carries over about 350 milligrams of B_{2}O_{3}. When Chigeffsky passed steam through a tube containing B_{2}O_{3} at 400°, it carried over so much of this substance that the flame of a Bunsen's burner into which the steam was led gave a distinct green coloration; but when, instead of steam, air was passed through the tube there was no coloration whatever. By placing a tube with a cold surface in steam containing B_{2}O_{3}, Chigeffsky obtained a crystalline deposit of the hydrate B(OH)_{3} on the surface of the tube. Besides this, he found that the amount of B_{2}O_{3} carried over by steam increases with the temperature, and that crystals of B(OH)_{3} placed in an atmosphere of steam (although perfectly still) volatilise, which shows that this is not a matter of mechanical transfer, but is based on the capacity of B_{2}O_{3} and B(OH)_{3} to pass into a state of vapour in an atmosphere of steam.