EQUISETUMS AND CALAMITES, 79 
seems tome to demand a very careful and dispassionate investiga- 
tion. 
[Note by Mr. D. Hanbury.—To the very interesting article of my 
friend Dr. Hance on Green Putchuk may be added a few lines show- 
ing how large a trade there is in this drug. r. Bowra, in the report 
referred to by Dr. Hance, estimates the total value of the export trade 
of 0 in 1868 at 6,073,709 taels, or about £2,026,903, of which 
some of which are far dearer. The supplies are chiefly derived from 
the plant which is cultivated, but the root of the wild plant is also 
collected, though to a very small extent.—D. H. ] 
ON THE ORGANISATION OF EQUISETUMS AND CALA- 
MITES. 
By W. R. McNas, M.D. 
[Read at the Meeting of the Botanical Society of Edinburgh, 
December, 12th, 1872. ] 
a sincere desire to help, f hi shed 
try and elicit the truth, and not to detract from the fine work done 
Pi : 
value because I approach the subject from, I venture to believe, a 
different point of view—namely, that of a botanist who wishes to apply 
what is known of recent forms tothe elucidation of the fossil, because 
it is to the recent forms I have given most attention. I shall, there- 
fore, make ample use of the figures and descriptions given by Prof. 
* Phil. Trans., 1871, p. 477. 
