316 BOTANICAL GAZETTE [October 



The writer feels deeply indebted to Dr. William Crocker, 

 and to Mr. W. S. Ballard, U.S. Department of Agriculture, for 

 valuable suggestions in regard to the apparatus for extracting 

 the gas, and for many helpful suggestions during the progress of 

 this work. 



U.S. Department of Agriculture 



Watson ville, Cal. 



LITERATURE CITED 



i. Appleman, C. 0., Study of rest period in potato tubers. Md. Agric. Exp. 

 Sta. Bull. no. 183. 1914. 



2. Aubert, E., Nouvel appariel de MM. G. Bonnier et L. Mangin pour 

 l'analyse des gaz. Rev. Gen. Botanique 3:97-104. 1894. 



3. Denny, F. E., Permeability of certain plant membranes to water. Bot. 

 Gaz. 63:373-397. 1917. 



4. Grafe, V., Ernahrungsphysiologisches Practicum hoherer Pfianzen. p. 377. 

 1914. 



S- Gerber, C, Recherches sur la maturation des fruits charnus. Ann. Sci. 

 Bot. VIII. 4: 1-280. 1896. 



6. Gore, H. C, Studies on fruit respiration. U.S. Dept. Agric. Bur. Chem. 

 Bull. no. 142. 1911. 



