FRITZEL’S INDEX. 43 
classed by their habitats as by their relations to each other. 
They will never be collected for exchange, and but rarely for the 
herbarium, as they are supposed to be of universal occurrence, 
and wilk readily be procured in their seasons. We think that not 
much above half the vegetation of a tract need be formally clas- 
sified nor followed with any notification of localities. The area 
of a tract having a radius of thirty miles, or a diameter of sixty 
miles, would be about 2900 square miles, or rather less than one- 
half of the superficial area of Yorkshire. As the Metropolitan 
counties, at least to the extent of thirty miles from London, do 
not reach the sea, and there is less variety of soil and altitude 
than there is in Yorkshire, the number of species in the London 
district thus bounded would not probably exceed 900, or would 
be 100 fewer than the Yorkshire plants. We think a very shim, 
portable, and cheap volume would contain all desirable informa- 
tion-im reference to the statistics and distribution of these spe- 
cles. 
Iconum Botanicarum Index locupletissimus; or, an Alphabeti- 
cal Register of upwards of 86,000 Representations of Phane- 
rogamic Plants and Ferns, etc. etc. By Grorce Avucustus 
PrirzeL, Ph.D., ete. London: Pamplin; Willams and 
Norgate. 
This elaborate work is a worthy companion to Steudel’s ‘ No- 
menclator Botanicus ;’ an entirely original compilation ; a very 
valuable work for reference ; and when its utility is appreciated, 
it will doubtless be in the hands of every scientific botanist. 
We have called it an original compilation because there is no 
previous compilation of this nature im botanical literature. 
The title precisely expresses its object. It is an index of bo- 
tanical figures or representations of plants. The care bestowed 
on it may be conceived from the author’s statement “that in 
spite of my great desire of completeness, I have nevertheless been 
obliged to reject more than 100,000 delineations as worthless.” 
The author further states that consistency constrained him to 
reject “single good original drawings in works like Loudon’s 
Arboretum, Berg’s Charakteristik der Pflanzengenera, Le Maout’s 
Lecons Elémentaires, etc., that have been passed over without men- 
tion.” “ Tcan only defend this by the principle I had laid down 
