vi 



Effects of conditions other than temperature and humidity 350 



Modification of normal development totals 356 



Part III. Methods of experimentation and calculation: 



Theory of thresholds and rates of development 357 



Velocity curves 358 



Evidences of the nature of the velocity curve 359 



Evidences of a constant total in metabolism 361 



Purpose of the present investigation 362 



(A) General results on pupae 363 



Mortality and failure to pupate 374 



Calculation of thresholds and velocities 381 



Preparation of the equal-velocity chart 387 



Pinal correction of the equal-velocity chart 391 



(B) Adult moths "tOl- 



(C) Eggs and larvae 40] 



Incubation period 401 



Time from hatching to leaving the apple 403 



Hibernated larvae 405 



Prediction of first pupation 416 



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



humidity 419 



Variability of temperature and humidity in weather con- 

 ditions 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 



ARTICLE VI. A STUDY OP THE CATALASE CONTENT OP COD- 

 LING MOTH LARVAE. BY C. S. SPOONER. (3 Tables) March, 

 1927 443-446 



Typical records of the volume of oxygen (in cc) obtained from cod- 

 ling-moth larvae 443 



Summary of data on catalase content of codling-moth larvae 444 



Catalase content of larvae kept over winter in cool dry air 445 



Conclusions 446 



Bibliographic reference 446 



