Books and their Enemies. 309 
The whitish appearance left by the poison can be 
removed, and the appearance of the binding much 
improved, by rubbing with vaseline. Old shelves 
may be painted over occasionally with turpentine or 
kerosine oil, and cloths wetted with the former placed in 
book-cases as preservatives against both mould and 
inse6ts. By these means something can be done towards 
keeping a colle6lion in order, but every book-lover who 
values his collection should overhaul it thoroughly at 
least once in three months. 
RR 
