102 "Mr. Turner's Remarks upon 



serration, fully prove the accuracy of their former possessor, agree- 

 ing precisely with the Historia 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 Dillenius 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 Ave 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. AVell, 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 Conferva?, 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 Jungermanniae. 



CONFERVA. 



