236 
REVIEW. 
Marlstone, at any point, would not in the least degree be a 
drawback to the success of a dumb-well constructed there. 
Other evidence with regard to the continuity and general 
porosity of the Marlstone will better appear in the next 
Section. 
'o be continued.) 
lie frith. 
The British Moss Flora. By B. Braithwaite, M.D., F.L.S. Part X. 
L. Peeve and Co. 10s. 
This part, which will he welcomed by moss students, concludes the 
first volume of this valuable work, and is about one-third of the whole 
work. It is illustrated by nine plates, on which are given delineations 
of forty-five species, and of these plates no word of praise can be said 
too much. The letterpress, of which there are seventy-eight pages, 
contains descriptions of the remaining species and varieties of 
Tortulacese, including the conclusion of the genus Mollia and the 
genera Leptodontium, Barbula, Leersia (the Encalypta of British 
authors), and the one British species of Weberaceseof Ehrhart, Webera 
sessilis (Diphyscium foliosurn , Mohr), illustrated by a full-page plate, 
which is a most beautifully finished one. 
Since the monograph of the genus Fissidens (Part IV. of this work) 
was published, Mr. Mitten has published in the Journal of the Linnean 
Society an important paper on this genus, which adds considerably to 
our list of species, and alters many of the older views. To bring the 
present work level with the times Dr. Braithwaite gives in this part 
eight pages containing descriptions of the new species, and also all 
alterations in nomenclature deemed needful. These are illustrated by 
one plate, and the extra pages are so paged that they may be added to 
Part IV. without any alteration of the general paging. In addition to 
this is a Supplement giving descriptions of the various species that 
have been added to our flora whilst the work has been in progress and 
since the issue of the various monographs to which they belong, and 
this is so well up to date that the newest addition to our flora is fully 
and well described. There are also addenda giving new localities for 
some of the rarer species, and a classified list of all the species described 
in Vol. I., and it is to be hoped that this latter may be completed and 
issued separately, as it would be a valuable aid for indexing herbaria, 
&c. The part concludes with a full index, title-page, etc., so that the 
volume forms a complete series of monographs of the various genera 
at present treated. 
The volume is also published in a complete form, containing forty- 
five plates, and giving details of 225 species, with 3,000 figures. Of 
these species about eighty are additions to the British Flora since the 
publication of Wilson’s “ Bryologia Britannica,” descriptions being also 
given of an equal number of varieties not recorded by Wilson. 
It is much to be desired that the two concluding volumes may be 
passed through the press at a quicker rate than the one just now com¬ 
pleted, and that the talented author may be spared not only to complete 
his great and valuable undertaking, but also to reap the honour he so 
richly deserves. J. E. Bagnall. 
