"A. J. M." writes: "While a dead limb may be injurious, I do not believe it transpires moisture as fast as a green one in leaf, and if the moisture was excessive, its evaporation would be beneficial. Where can we find the facts and figures of this evaporation?"

[A dead limb can scarcely be said to transpire, which is a term wholly applied to the action of a being with life. Moisture simply evaporates from a dry stick, and, by the power of capillary attraction, as fast as it dries, it will absorb moisture from any thing to which it may be attached that is moister than itself. - Ed. G. M].