Botany and Zoology. 467 
of iron and manganese, to which the variegated colors are due, 
for which the rock is so much admired. The specific gravity, 2°9, 
shows that it is aragonite. 
Ill. Botany AND ZOOLOGY. 
1. Relation of Coloration to Environment.—Mr. W allace’s over- 
sight about a “ Pelargonium of Kerguelen’s Land,” has been 
pointed out in Mature and noted in this Journal (p. 400). There 
flowers, apparently produced only at the close of summer, have 
capillary styles of half an inch to a full inch in length, mostly 
eeply three-cleft with unequal pie. sometimes three-parted 
rescence, Mr. Morong noticed that the flowers in his specimens 
Were triandrous ; but I find that some are diandrous. These long- 
anty. They : 
r Toate “piaiit) of Griffith’s Ben- 
gal collection. This American variety, or species, has narrower 
Spikelets and more carinate scales than is usual in 8. og aE 
