102 
Mr. Turner's Remarks upon 
serration, fully prove the accuracy of their former possessor, agree- 
ing precisely with the Hist or la Muscorum, according to which they 
are arranged, each fastened on thin pasteboard, and marked with 
the name as well as generally also with the number it bears in that 
work. The Submersed Algae were our leading object : in these, 
therefore, I shall notice every individual ; but in the Mosses and 
Lichens shall mention no species, except where it appears that 
the plants designed by Dillcnius have been misunderstood. In 
undertaking a task of this kind it would be unpardonable pre- 
sumption to suppose that we have detected every error in the re- 
ferences of authors to this Herbarium, or that we have ourselves 
fallen into none. We know that the former of these is not the 
case, and we have every reason to fear that the latter is equally 
improbable. We beg, therefore, for the same indulgence towards 
our errors that we show towards those of others ; and, above all, 
we deprecate the suspicion of our being urged to publish these 
remarks by a wish to detract from the reputation of preceding 
writers, or by any other motive than the most earnest desire to 
promote the cause of science. We offer these cursory observa- 
tions as little more than an inducement for more able botanists to 
follow our example with greater effect. Well, indeed, may we be 
convinced of their imperfections ; for, independent of the inade 
quacy of our own abilities to the task, it would require at least a 
week of uninterrupted leisure to examine properly the Dillenian 
Herbarium, and it was in our power to bestow but one day upon 
the investigation : this day Dr. Williams obligingly allowed to 
be both long and unbroken, but still it served us only to look 
through the Confervas, Ulvae, Lichens, and Hypna, with some 
attention, and to take a hasty view of the remaining genera of 
Mosses, but not to open a single sheet of the Jungermannige. 
CONFERVA. 
