Hair Brushes. The use of a moderately hard brush for the head keeps up a healthy circulation, and is on every account to be preferred to the employment of a comb. The scurf, as it is called, which collects on the head from neglect, arises not from, at least only in a very small degree, the. dead cells or scales of the scalp being thrown off, but from the evaporation and hardening of the secretions which are poured out on the scalp. Washing is much less effectual in removing this incrustation, in consequence of its greasy nature, than brushing.