437 



ACKNOWLEDGMENTS. 



The writer is indebted to Mr. W. P. Flint and Mr. P. A. Glenn for 

 assistance of various sorts during the course of the work and the prepara- 

 tion of the manuscript. Mr. C. S. Spooner, while employed as entomol- 

 ogist, contributed in a very important way to the experimental work, 

 particularly the parts on the egg and the larva in the apple ; but, leaving 

 the employ of the Natural History Survey in 1920, he found it impossible 

 to write these sections. 



The writer is indebted to Professor James M. White, Supervising 

 Architect of the University of Illinois, for the care with which the special 

 equipment was installed and also for the careful oversight given by his 

 department to the service required to run the equipment; to Mr. M. C. 

 Munson for much advice in iDuilding the equipment; to Professor H. B. 

 Ward for the use of equipment belonging to the Department of Zoology; 

 and to Professor H. H. Jordan for advice in engineering questions. With- 

 out the co-operation of the other departments concerned, the task would 

 have been extremely difficult. 



Finally, acknowledgments are due to the Survey editor, Mr. H. Carl 

 Oesterling, for a painstaking study of the paper and entire data, which 

 resulted in important improvements of the cross-referencing and general 

 improvement of the entire paper. The text of Parts I and II was recast 

 and expanded by him. 



BIBLIOGRAPHY. 

 Apstein, C. 



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Babcock, S. M. 



1912. Metabolic Water: its Production and Role in Vital Phenomena. 

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1853. Des climats et de I'influence qu'exercent les Sols boises et non 

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1923. Body fluid of the honey bee larva. Jour. Biol. Chem., 58: 543-564. 



1923. Autolysis and Insect Metamorphosis. Jour. Biol. Chem. 58: 567-582. 



CANDOLI.E, A. DE. 



1855. Geographic Botanique, Raisonee. Paris (Cites 1830 paper). 



