THE PLANTS OF THE SEA. AI 
plant contains carbonate of lime, deposited in fine grains and in 
concentric layers. 
Delile has left among his papers an unpublished monograph 
upon this vegetable wonder. M. Woronine has just published the 
NEREOCYSTIS. 
(Nereocystis Lutkeana.) 
results of his examination of its organisation. He writes: “The 
stalks enlarge at the summit, and produce many successive whorls 
of confervoid branches. The lower ones, decaying, drop off, and 
their points of attachment become obliterated. New and_ higher 
whorls continue to grow; at last it reaches a stage of its growth 
when it seems a bundle of whorled tubes formed into a circular 
