The Cell in Mitosis

methods completely intelligible. The largest chapters are those dealing with paper and gas chromatography since these are the methods which have received the widest application and in which marked advances have been made in recent years. These sections are profusely illustrated with diagrams of the types of apparatus employed, and the descriptions are particularly detailed. A short section on Zone electrophoresis is incorporated in the chapter on paper chromatography. Adsorption and ion-exchange chromatography are treated adequately, but thin-layer chromatography, a technique at present in vogue, receives little more than a page. Of particular interest to those engaged in teaching chromatographic techniques is a chapter on model experiments in which 18 experiments involving all types of chromatography are described. The appendix contains a useful list of color reagents for metal ions, amino-acids, and sugars, as well as brief directions and diagrams for preparing a simple Katharometer and a flame ionization detector for gas chromatography. The bibliography is extensive, containing some 270 references to books and original articles. This book is highly recommended.