THE HERBARIUM. 373 



degree preserved if, according to the practice of other 

 Algologists, a coat of varnish were given them before they 

 are placed in the herbarium. 



It is a general complaint that the PorjjJii/rce do not 

 adhere to paper in drying, but shrink and become torn, in 

 consequence of starting from the paper. This is very easily 

 prevented. Let them be spread out and covered with mushn 

 in the common way, but let not the muslin be removed for 

 two or three days ; yet, though the muslin is to be allowed 

 to remain, let them have, along with tlie other species, a 

 supply from time to time of blotting-paper, not only dry, 

 but heated at the fire. In four or five days they will be quite 

 dry, and they will adhere so firmly to the paper that they 

 will seem a part of it. 



Very gelatinous kinds, such as Gloiosijoho^iia, Mesogloia, 

 Batrachospermmn, Draparnaldia, &c., would in some cases 

 be destroyed, if covered and pressed in the manner we have 

 directed. They would be bruised by the pressure, and 

 would adhere to the muslin or paper, however lightly laid 

 over them. They must be allowed to lie exposed to the 

 air till they are dry, and then, after moistening with a 

 sponge the under side of the paper, strong pressure may be 

 applied to them. But, though these cautions are in general 



