1886. ] BOTANICAL GAZETTE. 123 
or aiaihe pat ab this difficult and ‘piven us a book of convenient form 
iss i i ed in a space. There i 
2 
he necessarily high cost of a book with nu s good plates, it seems to us 
ei that a raperar eae paces k should siege co oii lanes, yr ds: nal ates are 
required, they can better be provided in the form of charts or a 
The pilnctisi: of latvia: to be studied is a guod one and aaa aa to 
occupy the student’s time for several months at least. We would suggest, how- 
it mi d some i ysei 
ever, that ght have been well to ome common lichen like Physcia 
stellaris, for the biological relations of the lichens are important and likely t 
interest th nt. The proportion b 0 nded, for, 
although a greater nu of species of Thallophytes nate presented, the spac 
devoted to that group is less than half as great as that Archegoniata 
and less than a third of that assigned to enogam By the arrangement 
adopted, the student starts by observing a few things, and as he advances and 
becomes more proficient he can wor ore exhaustive 
f it is necessary to train the ofser vine wi ers of students, as is almost 
ati Ways the case at the present time, there is, of ¢ a danger that a hand 
ook like the present may be abus ed ui, that the sian may rely too esac 
on the directions aires In the pee site the authors call attention to the pos- 
sibility of such a use and m neem pr aie oe if a teacher 
and n row 
ri he should subst ute other species nearly related botanical - those given 
nthe book. The weraeivastos work would apply as before, but the student 
pecans have to work out details for himself. W. G. Fartow 
ike euegl iiber Bacterien. Von A. 48 gobs Leipzig: Wilhelm Bagelibann? 
146. 18 woodcuts. 
It is with; 
%s part of his Mor pikes nd Bi ologie der Pilze Myce und Bacterien. The 
present work follow ¢c 
e D 
pass of the previous work. It is also, for the most part, in a more simple and 
ce style, which comes from the matter having first been given in a series 
a. 
The r does ir Praising. to peorere z ets devoted to apg Poe 
regarding aia cases of interest and importan “s ies teriology,” but to afford 
I survey ject which may vi e one to find his way intelli- 
gently among the multiplicity of details. As one Nes not properly see t 
or the houses, o t bee of the trees, unless a comma g position 
be Obtained, so it is in the mazes of this new science. This is the great service 
which the author has done, to point out in a maste rly way the true relation of 
the facts to 0 one another, and to bring the whole into harmony with the other 
departments of bio ogy. 
di wing is an outl ine of the contents of the book. The use the 
words baste and fungi is discussed. The structure of the hackestan cell, 
the forms ah cells and of cell-families, and their development are ert ely 
treated. When the author points out how simply the different for of the 
single cells of bacteria may be illustrated, he more deeply en - a Die aggre 
of the student who is at the same time an instructor. es One 
Separate them into round-celled forms and two rod-forms, sraipet and peiral: 
A billiard ball, a pencil and a sirks crew represent these three forms with much 
accuracy, so that expensive illustrative models are not nee 
a he whole w as been presented with much perspieuity 5 it has also 
been divested of that remoteness and “5 genes with which we are wont inte 
the subject. This has been by tracing many ae ogies wi 
regard 
familiar facts pertaining to higher saornsoert a In speaking of the necessity 
