CONTENTS 



Preface v 



I. Avoid Fruitless Experiments. By Fred M. Uber 1 



II. Osmotic Pressure Measurements. By David R. Briggs 39 



III. Centrifugation. By E. G. Pickels 67 



IV. Viscosity Measurements. By L. V. Heilbrunn 107 



V. Temperature Determinations. By Lawrence R. 



Prouty and James D. Hardy 131 



VI. Calorimetric Measurements. By Max Kleiber 175 



VII. Quick-Freezing and the P'reezing-Drying Process. By 



Earl W. Flosdorf 211 



VIII. Bioelectric Measurements. By Howard J. Curtis. . . . 233 



IX. Electrophoresis. By David R. Briggs 271 



X. Ultrasonic Vibrations. By Earle C. Gregg. Jr 301 



XI. When to Use Special Microscopes. By Oscar W. 



Richards 343 



XII. Electron Microscopy. By James Hillier 381 



XIII. Action Spectra and Absorption Spectra. By Harold 



F. Blum " 417 



y 



.XIV. X Rays and X Irradiation. By John W. Gowen 451 



XV. Electrons, Neutrons, and Alpha Particles. By L. H. 



Gray * 491 



XVI. Stable Isotopes as Tracers. By Fred M. Uber 561 



XVII. Radioactive Tracers. By Adolf F. Voigt 599 



Subject Index 655 



61438 



IX 



