In the charge system, the process is intermittent, one charge being removed before a new one is admitted.

This gives the best results with high grade lumber for special uses.
A modification of hot-air-seasoning is that which subjects the wood to a moderate heat in a moist atmosphere charged with the products of the combustion of fuel.
(3) Small pieces of wood may be effectively seasoned by being boiled in water and then dried.

The process seems to consist of dissolving out albuminous substances and thus allowing freer evaporation.

Its effect is probably weakening.
(4) Soaking in water is sometimes used as a good preparation for air-seasoning.

Previous soaking hastens seasoning.