180 Miscellanies. 
ularly in vegetable anatomy and physiology, that this portion of the 
work has necessarily been entirely re-written, and has assumed almost 
a new aspect in the present edition; and even during the short period 
that has elapsed since its publication, many interesting discoveries 
have been made. Theadditions most worthy of notice area new and 
more minute classification of elementary tissue, recently proposed by 
Morren; much interesting matter concerning the generation of cel- 
lular tissue ; a good account of recent discoveries respecting the va- 
rious forms of tissue composed of membrane and fibre combined, 
which are found to be of almost universal occurrence; the article on 
the laticiferous tissue of Dr. Schultz; and that on Raphides, con- 
cerning which there is an account in the appendix by Mr. Queckett. 
In the chapter on the compound organs of flowering plants, there is 
an account of the views of Prof. Mohl concerning the structure of 
endogenous stems; an analysis of Bronn’s memoir on the spiral dis- 
position of leaves; and much additional information concerning the 
structure and development of pollen, which will be new to most Eng- 
lish readers. The remarks on placentation are interesting, especially 
as the subject is now exciting considerable attention; Dr.\Lindley 
defends, for the most part, the doctrines of Schleiden and Endlicher 
on this subject. The chapter on the chemical constitution of the 
elementary organs, is condensed from the researches of Payen and 
Schleiden, which are models of chemico-physiological investigation. 
The most interesting additions to the subject of vegetable fertiliza- 
tion, are the analysis of Mr. Griflith’s recent memoir on the singular 
_ Structure and the impregnation of the ovulum of Santalum; and a 
(too brief) notice of the novel doctrines which have lately been 
broached by Endlicher, Schleiden, and others respecting the sexuality 
of plants. The opinion of Endlicher is “ that what we call pollen is 
analogous to the spores of cryptogamic plants, and that consequently 
the anther is a female organ, whose contents perform an act similar 
to that of germination when they fall upon the stigma.” The vieW 
of Schleiden, although differently expressed, amounts to the same 
thing ; he also considering the anther as nothing but a female ovariua), 
and each grain of pollen the germ of a new individual. The subject 
is exciting much attention; and since the publication of this edition 
of Dr. Lindley’s work, Mirbel has read a paper before the Institute 
of France, in which the views of Schleiden are attacked, and the com- 
monly received Linnwan hypothesis defended. It is to be regretted 
that there is no detailed account of this controversy in the English 
language. The idea which seems to have given rise to these specula- 
Hons is undoubtedly true, viz. that the organization of pollen and of the 
ores of cryptogamic plants is remarkably similar, and that their 
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