If you are ever in Brooklyn, that borough of superb sunsets and magnificent vistas of husband-propelled baby-carriages, it is to be hoped you may chance upon a quiet by-street where there is a very remarkable bookshop. This bookshop, which does business under the unusual name "Parnassus at Home," is housed in one of the comfortable old brown-stone dwellings which have been the joy of several generations of plumbers and cockroaches. The owner of the business has been at pains to remodel the house to make it a more suitable shrine for his trade, which deals entirely in second-hand volumes. There is no second-hand bookshop in the world more