180 OF THE HERBARIUM. 



those Fungi and Algas which cannot be preserved in the 

 herbarium, on account of their size and roughness. Mi- 

 croscopic Fungi, on the other hand, growing on leaves, 

 twigs, &c, should be fastened down by adhesive slips, 

 [but in such a way as to allow of their being taken out 

 and replaced, Ed.,] all superfluous wood having first been 

 removed, so as to render the specimen as thin and flat as 

 possible. Sections of the pileus, hymenium, &c, may . 

 be similarly treated, and put away in the herbarium. 



Finally, as regards the Algas, the original conditions of 

 their preparation, as the reader will remember, necessitated 

 the application of paper, before they were removed from 

 the water ; to this support they generally cling with the 

 greatest tenacity, scarcely rising above the surface — indeed 

 very often having all the appearance of a delicate painting. 



The precautions requisite for the preservation of the 

 Diatoms and Desmids have been already fully described, 

 in the chapters devoted to those subjects. 



Every plant should have a label attached to it, on which 

 is inscribed its name and certain other notices, which 

 should not be omitted. 



These are — 



1. The name of the family, genus, species, and variety, 

 in the Latin language. The Latin tongue (interlarded 

 with Greek) has been fixed upon, by common consent, as 

 the medium of communication in the scientific world, or, 

 at least, over the wide domains occupied by the kingdoms 

 of botany and zoology. By this means uniformity of 

 nomenclature and accuracy of description are to a large 

 extent obtained : more so, at any rate, than when the titles 

 are given in either of the living languages ; for these are 

 of merely local value, are without meaning to foreigners, 

 and often incomprehensible beyond the narrow limits of a 

 district. 



2. The name of the author, that is, of the person who 

 first gave the species the denomination, by which it has 

 since been recognised. It is written in an abbreviated 



