(D) Velocities as affected by factors onier than temperature and 



humidity 419 



Variability of temperature and humidity in weather conditions. . . 419 



Rainfall and submergence in water 420 



Air movement and evaporation 422 



Quality and intensity of light 423 



Food 423 



Mechanical stimuli 423 



Seasonal march of temperature and humidity 424 



(E) Experimental methods 426 



General equipment 426 



Measurement of temperature, humidity, and air movement 430 



Special methods 432 



Recording of data 434 



Summary of conclusions 436 



Acknowledgments 437 



Bibliography 437 



