M. C. Lea on the Ethyl Bases. 25 
studied again with constant advantage and pleasure. If the 
great fossil flora of Brongniart was finished, it would suffice for 
the study of the coal plants, at least for the general acquaintance 
so desirable to direct the researches. 
From England, we have the Fossil flora of Great Britain, by 
Lindley and Hutton, (8 vols. 8vo). Many species of the coal 
measures and of the oolitic formations are described and figured 
in this work, which is certainly very valuable. But it is made 
without any systematic arrangement and without method. The 
descriptions are moreover far from being satisfactory and the 
drawings too artistical or imaginary. 
I have already mentioned the remarkable memoir of Dr. 
ker, who is certainly one of the greatest botanists of our time. 
From polished lamells of fossil cones of Lepidodendron, he has 
exemplified the fructification of this genus as clearly and as 
perfectly as it could have been done from living specimens.* 
Artis, Antediluvian Phytology, &c., is a good book for the plates, 
but scarcely of any use now to the student of fossil plants. e 
Same may be said of Mammats, A Collection of Geological Facts 
and Practical Observations, &e. But Witham’s work on the Internal 
Structure of Fossil vegetables is, like Corda’s Beytriige, very valuable 
to direct the researches of comparative anatomy in the study of 
the internal structure of the fossil woods. A number of fossil 
Plants of the coal are described and figured in English works on 
Geology by Lyell, Buckland, Miller, Mantell, &c. 
(To be continued.) 
Arr. V.—On the Production of the Ethyl Bases; by M. CAREY 
Lea, Philadelphia. , 
by these reactions had been already indicated, I discontinued 
interesting paper, in the Transactions of the Linnean Society, vol, xx, part 8, enti- 
tled Phar team of an Undescrib Fossil Fruit, which, re nk “—. eae, 
o robus.— 
- Jour. Sc1.—Seconp Series, VoL. XXXII, No. 94.—JuLy, 1861. 
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