Mildew in Books

Your correspondent B. suggests that "any hints as to the cause or remedy of *mildew in books* will be most acceptable." I venture therefore an opinion that the cause is to be found in the defective bleaching and manufacture of the rags from which the paper is made and the careless or intentional admixture of linen with cotton rags. The comparatively modern method of bleaching with oxymuriate of lime, or chlorine in substance, with the ad-libitum and unacknowledged admixture of gypsum (to give weight and firmness to the paper) are, I believe, the true causes of the defects in question, which ar…