1890.] Botany. 473 
error which should have been corrected before now. On page 1152, 
referring to the Ornithopoda he says: ‘‘ The ilium generally has its 
preacetabular process much elongated, although this is not the case in 
the type of Camptosaurus ;’’ and on page 1158, ‘‘ The posterior por- 
tion of the ilium of this species [/gwanodon fittont | is indeed almost 
indistinguishable from that of Camptosaurus.” If one will compare 
the figure of the pelvis of Camptosaurus dispar on page 1153 with that 
of Jguanodon dawsoni on page 1158, he will be struck with the strong 
resemblance throughout, except of the anterior portion of the ilium.” 
The fact is that the figure of the former is wrong. The anterior por- 
tion of the ilium of the type had been broken off and weathered, indi- 
cations of which are distinctly seen in the specimen. Prof. Marsh ha 
this demonstrated to him more than five years ago, and there are other 
ilia in the Yale Museum in which this process is complete. It is to be 
hoped that this figure will be banished from text-books in the future, 
and that no new genus will be made on the supposition that the process 
is wanting.—S. W. WILLISTON. 
BOTANY. 
The Assimilation of Carbon by Green Plants from Certain 
Organic Compounds.—Under this title Mr. E. Hamilton Acton 
publishes in the Proceedings of the Royal Society (Vol. XLVII., p. 
150) the results of ah interesting series of experiments made by him 
to determine whether it can be produced in the assimilating cells of 
green plants when supplied with certain organic compounds, in the 
absence of carbon dioxide from the air. The following summary will 
give the essential parts of the paper. 
The apparatus used consisted of a tall bell-jar, perforated at the top, 
and accurately ground at the bottom. Into the top an india-rubber 
stopper was accurately fitted, and through this were passed two bent 
glass tubes, each leading to a U tube filled with soda-lime. Inside of 
the bell-jar were placed a glass culture cylinder, a small dish of soda- 
lime, a couple of dishes of water, and a test-tube filled with a solution 
of caustic potash, The bell-jar was set upon a glass plate, and the 
contact was rendered air-tight by the use of a mixture of vaseline, 
résin and beeswax. 
