REVIEWS. 
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u 2. The characters, structure, and, as far as possible, the natural history of the 
genera and species of British animals and plants of microscopic dimensions, 
together with a description of the microscopic organs and appendages of animals 
and vegetables generally. 
“ 3. An account of the elementary tissues of two great kingdoms of organized 
beings, with full information as to the methods to be pursued in this department. 
“ 4. The distinguishing characters of the inorganic matters occurring in animal 
and vegetable fluids.” 
We need now only add, that this work will appear in monthly parts— 
price half-a-crown each, and that it is proposed to be completed in about 
12 parts, and will be illustrated with about forty plates. 
Botanical Letters to a Friend. By Dr. F. Unger. (Translated by 
Dr. B. Paul.) Pp. 116. 8vo. London : Samuel Highley. Price 5s. 
These very attractive letters which are now issued in an English dress, as 
part of u Higliley’s Library of Science and Art,” will, doubtless, be gladly 
hailed by many who could only be acquainted with them through the 
medium of a translation. Their author is already well known as the 
founder of a natural system of Fossil Plants, published in Endlicher’s 
Genera Plantarum. 
Though, we confess, they bear but too evident traces of being a trans¬ 
lation, they are, nevertheless, pleasingly written, and form a most welcome 
addition to our stock of botanical text books. The views advanced are 
stated with a simplicity and clearness not often to be found in writers of 
the school to which Dr. Unger belongs, and, while some of the theories 
propounded will meet with but little favour from many British botanists, 
still a statement of them put forward in a popular form will be thankfully 
received. It was our intention to have presented our readers with a few 
extracts from the concluding letters which are most suggestive, but we 
refrain from a conviction of how disjointed any extract from a letter 
must necessarily appear to those who are unacquainted with the original. 
We would, however, refer them to the sketches of the “ Plant-ivorld ,” as 
contained in the 15th and 16th letters; here it is viewed under the heads 
of u Local Distribution ” and u Chronological Aspect ,” as deserving of an 
attentive perusal, and likely to afford matters for reflection even to those 
who are disposed to question the views which are contained in them. The 
work is neatly brought out, and the wood cuts, which are numerous, 
greatly enhance its value to the student, from the strict accuracy of their 
details. Considerable praise is due to the exertions of the publisher of the 
series of which this forms a portion; and we will be much surprised if it does 
not meet with considerable support, if conducted at all equal to Dr. Unger’s 
Botanical Letters, which we gladly recommend to our botanical readers. 
