The Recent Change of Attitude toward the Law of Scientific Apparatus and Laboratory Methods: Cause and Effect: PROFESSOR P. W. BRIDGMAN ...... 539 The Shapometer: a Device for Measuring the Paleontology versus Devriesianism and Genetics in Shapes of Pebbles: PROFESSOR ALLEN C. TESTER the Factors of the Evolution Problem: DR. HENRY and H. X BAY. Apparatus to Circulate Liquid FAIRFIELD OSBORN ......

In the past two decades, great progress in the biological sciences has come from the incorporation of history in understanding basic mechanisms in fields ranging from ecology and conservation biology to physiology and developmental biology. This conceptual expansion has been promoted in large part by theoretical, methodological, and empirical advances in two seemingly disparate fields. The firs...