Modern Problems. Edited by J. A. Hadfield, M.A., M.B., Ch.B. University of London Press. 5/-. In this volume is published a series of lectures held at the Institute of Medical Psychology i11 London. Dr. J. A. Hadfield contributes an Introduction, and the subjects dealt with are^ " National Character and National Sentiment, by Professor Morris Ginsberg; " Psychology and Racial Differences," by P...

Plasticity in hatching can balance risks of benthic and pelagic development and thereby affect the extent of larval dispersal. Veligers of the nudibranch Phestilla sibogae hatched from their individual capsules if the encapsulated embryos were scattered from a torn gelatinous egg ribbon. Hatching occurred as early as day 4 at 231–251C. The early hatchlings lacked a propodium, swam, and were not...

Several austenitic stainless steels suitable for high temperature applications because of their high corrosion resistance and excellent mechanical properties were investigated as biomaterials for dental use. The steels were evaluated by electrochemical techniques such as potentiodynamic polarization curves, cyclic polarization curves, measurements of open circuit potential, and linear polarizat...

All steels contain some amount of dissolved gases such as oxygen, hydrogen and nitrogen of which nitrogen is effective in improving the mechanical and corrosion properties of stainless steels if it remains in solid solution or precipitates as very fine and coherent nitrides or carbo-nitrides with iron or alloying elements. When nitrogen is added to austenitic steels it can simultaneously improv...