P62): The Botanical Gazette. [May, 
all of them spores or the homologues of spores, seem to draw little 
support from the fact recorded. It is well said though by Hartog 
that the whole eight-cell group should be considered as egg-organs 
and not in any part as prothallium. I made this point in the note 
that was withdrawn, from a consideration of the staining phenomena 
mentioned above, and it seems not unlikely that it will be supported. 
It is very evident that the endosperm of the Metasperme is a 
different structure from that of the Archispermz. It is probable that 
the two types are to be referred to different generations, that of the 
Archisperme to the gametophytic and that of the Metasperme to the 
sporophytic.—Conway MacMILLan, University of Minnesota. 
A bit of the flora of Central Arizona—During July and August of 
last year I was collecting plants and studying the flora of Central Ar- 
in nearly all parts of Southern Arizona, and is perfectly at home are 
the driest mesa, where, in some years, it is without rain for severa! 
a hard, rocky subsoil. No doubt the gum which covers the = 
like a coat of varnish aids greatly in retarding the evaporation 
moisture. 
, a 
As lide reached the mountains, our route brought us to the ne 
Fria River, which in July was almost dry. The banks of this stre@" 
