REVIEWS AND NOTICES OF BOOKS. 365. 
in a most readable and interesting fashion. This and the 
wealth of illustrations which accompany the text make the 
work one which far surpasses anything else of its kind at present 
in existence. 
The Index is in the form of a register, which must have 
cost an enormous amount of labour in its compilation, and it 
has been framed in such a way that complete references regard- 
ing any one of the species mentioned in the book may be found 
with the greatest facility. j Wie Ba 
Kiinstliche Diingung im Forstlichen Betriebe. Von Dr FR. 
GIERSBERG. 
This excellent pamphlet has now reached the third edition. 
It was originally published in rgo1, and the cordial reception with 
which it met called for a second edition in 1903. That edition 
was also rapidly sold out, and for some months back attempts 
to obtain a copy of the latest edition have met with the same 
reply—“ Sold out.” This is sufficient guarantee that Dr 
Giersberg’s work is thoroughly sound, and that the subject is 
receiving very widespread attention. 
Although the whole subject is one of comparatively recent 
date, it is surprising to find how much has been done in the 
way of experiment in various Continental countries. The 
success which attended the earlier experiments on the use of 
artificial manures in forestry has led to their more general 
adoption in the State forests, and also in communal and private 
forests in different countries. 
The pamphlet is full of valuable information. A _ very 
important and interesting feature of the booklet is the great 
number of photographic records of experiments that are being 
carried on at different places. In many cases where the soil 
is of a very poor quality, the difference between the success or 
failure of the trees depends directly upon the use or non-use of 
artificial manures. Sometimes it may be even impossible to 
afforest certain tracts with timber-trees unless the soil is 
artificially enriched. 
The author has put himself to no little trouble to collect as 
much information as possible concerning the effect of the 
various artificial manures on tree-growth. He also gives the 
opinions and experiences of a large number of highly-trained 
