Note 677 — Chapter VIII · Askabad and Merv

This is a by-product of petroleum distillation, and termed, in Russian, astatki. After the more volatile illuminants have passed over, a residue remains in the shape of a ropy greenish-brown fluid, which in former days was considered valueless. It is now rapidly superseding coal as a steam raiser, and the recent rise in the market price of crude petroleum is in great measure due to the constantly extending use of astatki on steamers and railways.