Notes on Recent Literature. 
m 
habit of a Mangrove. This aeriferous tissue is, however, asso¬ 
ciated with a certain amount of internal and external phloem. 
I.M. P.B 
LITERATURE CITED. 
1. Bertrand, P. “ Etude du stipe de l’Adelophyton Jutieri (B. Renault).” 
Memoires de la Societe des Sciences de Lille, 1907. 
2. Renault, B. “ Structure comparee de quelques tiges de la Flore carbo- 
nifere.” Nouvelles archives du Musee, serie 2, vol. 
II., 1879. 
3. •,•,• “Notice sur les travaux scientifiques de 11. Renault. 
Deuxieme Supplement.” Autun, 1901. 
4. Tansley, A. G. “ Lectures on the Evolution of the Filicinean Vascular 
System.” Lecture VII., New Phyt., 1907. 
“Hayward’s Botanists’ Pocket-Book”; 13th ed., revised 
and enlarged by G. Claridge Druce, M.A., F.L.S. ; London, 
G. Bell and Sons; 1909. 
Hayward’s pocket flora has already had a useful career of 
almost thirty years; and Mr. Druce has performed an excellent 
service to British botanists in bringing this little book up-to-date 
so far as the circumstances would permit. The size and general 
arrangement of the book remain unaltered ; but there are some 
necessary changes in the rearrangement of the families. For 
example, the Coniferze no longer appear as Dicotyledons ! The 
names of the families have been changed in some cases; thus, 
Lamiacese displaces Labiatae, probably on the ground that it is the 
earliest name of the family ending in -acece. 
In a book of this nature, abbreviations in the text are necessarily 
of very frequent occurrence ; but a large number of them are not 
given in the introduction under the heading “ Explanation of 
Abbreviations.” 
The greatest change is the introduction into the text of a large 
number of “ elementary species ” and varieties; and consequently 
the nature of the book has been radically altered. Doubtless there 
will be some differences of opinion as to the wisdom of this course ; 
but for our part we are genuinely pleased that Mr. Druce has 
adopted it. For the first time, British botanists are in possession 
of an account—necessarily a brief one, in a pocket flora-—of the 
petites especes of their own country. The recent work of Mendel, 
de Vries, and Bateson has given to the study of these forms a much 
greater importance than before; and many modern field botanists 
