1. External and internal factors in sexual activity. Effect of irradiation with different wave-lengths on the mechanisms of photostimulation of the hypophysis and on testicular growth in the immature duck;Benoit;Yale J. Biol. Med.,1944
2. Spermatogenesis in Sturnus vulgaris: Refractory period and acceleration in relation to wave length and rate of increase of light ration;Bissonnette;J. Morphol.,1931
3. Photodynamic Action and Diseases Caused by Light;Blum,1941
4. Some effects of colored illumination on the sexual activation of the male starling;Burger;J. Exp. Zool.,1943
5. Influence of light on age at sexual maturity and ovulation rate of pullets;Callenbach;Pennsylvania Agric. Exp. Sta. Bull.,1944