94 



BOTANICAL GAZETTE 



[august 



Chicago, where they grow abundantly. The work has all been 

 done at the Hull Botanical Laboratory of the University of 

 Chicago, most of the experiments having been carried on in the 

 conservatory. The results are given here only in outline. A 



Fig. I.- — Typical air plants, bearing seed. 



more detailed account will appear later, when other phases of 

 the work now in progress will be presented, 



Pr^serpijiaca palustris grows in low, swampy situations usually 

 flooded in the spring and early summer, and subject to occasional 

 submergence throughout the season. The shoots develop equally 

 w^ell in air and water and present two very distinct forms. When 



