A Bibliography of Colloid Chemistry.—By Harry N. Holmes. The National Research Council has Recently Issued a Colloid Bibliography in Mimeographed form. The Author, Dr. Harry N. Holmes of Oberlin College, Chairman of the National Research Council Committee on the Chemistry of Colloids, Intends this Edition to be Preliminary to a More Comprehensive one. Yet it is a Book of 135 Pages Containing 1800 References on 106 Topics. All the References are Classified and Many are Accompanied by Brief Comment as an aid in Deciding on their Relative Importance. This book of 135 Pages may be Purchased from the Washington Office at $1.00