103 



History Museum, Balboa Park, San Diego, Calif. ; Miss Lilian C. 

 Heinold, 142-15 249th St., Rosedale, L. I., N. Y. ; Miss H. Anna 

 Kennedy, 30 Park Ave., South Weymouth, Mass. ; Mr. Boris A. 

 Krukoff, New York Botanical Garden, Bronx Park, New York, 

 N. Y. ; Brother Leon (Joseph Sylvestre Sauget), Colegio De 

 La Salle, Vedado, Habana, Cuba. 



The resignations of Dr. E. P. Meinecke, c/o Forest Service, 

 446 Phelan Building, San Francisco, Calif., from annual member- 

 ship; and Miss Faye C. Horton, 3416 93rd St., Jackson Heights, 

 N. Y. ; Mr. W. D. Vanderbilt, 527 W. 121st St., New York, N. Y. ; 

 Mrs. S. S. Vanderbih, 527 W. 12ist St., New York, N. Y., from 

 associate membership were accepted with regret. 



The nomination of Dr. A. H. Graves, Dr. Ralph H. Cheney, 

 and Dr. J. J. Copeland to serve on the auditing committee was 

 announced by the President. 



Dr. M. A. Raines of Howard University gave a lecture in the 

 scientific part of the program on "Methods of Growing Plants in 

 Water and in Air.'' The speaker's abstract follows : 



A project to devise a method of growing plants especially suited for 

 studying root growth by time-lapse motion picture photography has resulted 

 in the development of the "Wick-Culture Technique"- — in which the plant 

 roots develop on the surface of a sheet of absorbent material (such as black 

 blotting paper) supported in a nearly vertical position and supplied with 

 water from above. In the preferred form of this set-up, the absorbent sheet 

 rests against a sheet of plate glass, the roots developing between the absorb- 

 ent sheet and the glass. The recent development of glass cloth greatly extends 

 the possibilities of the wick-culture technique for investigations on root 

 physiology and pathology. 



Experience with a "Germinator for Root Work" (constructed on the 

 principle of the set-up for wick culture) was taken to indicate that gentle 

 washing of the surfaces of a plant situated in a moist chamber retards the 

 development of mold on them. This has led to experimentation with a "Spray 

 Chamber" — essentially a moist chamber equipped with facilities for sub- 

 jecting plants contained in it to a spray of water. In the spray chamber plant 

 turgor is not only maintained, but may be increased. An indication of the 

 possibilities of the spray chamber is given by its successful use for obtaining 

 abundant regeneration of roots on large leafy cuttings of willow, poplar, and 

 other plants. On the debit side, it must be noted that prolonged washing 

 may be harmful to the plant. A variation of the spray chamber is the "x\erated 

 Moist Chamber" in which air is bubbled through water at the bottom of 

 the moist chamber. 



A second project, on methods of feeding soluble carbohydrates to plants, 

 had led to the demonstration that this may be accomplished without steriliza- 



