680 MANUAL OF NATUEAL HISTORY. 



stones, old wood, trunks of trees, &c., a portion of 

 the material on which they grow must be kept with 

 them, and each specimen be separately wrapped up 

 in soft paper. Minute specimens of Cryptogamia 

 may be dried at once, and placed on white paper with 

 a little gum-tragacanth mucilage. Marine Algce are 

 collected along the sea-shore, especially after a storm, 

 but are more abundantly procured by dredging, or 

 by closely examining nets, fishing lines, &c., when 

 hauled up ; fine varieties should be kept in a bottle 

 of sea-water until prepared. Fresh-water Algce are 

 obtained by searching ponds, lakes, streams, &c. Ma- 

 rine species are most easily and most quickly pre- 

 pared for transmission, by drying them quickly and 

 thoroughly, without previously washing them, and 

 then packing them loosely in bags or boxes. Small 

 and delicate specimens must, however, be put up at 

 once. This is effected by washing them first in salt 

 water, next in a little fresh water, and then also in 

 fresh water floating them one by one in a shallow- 

 dish ; under the specimen a piece of white paper is 

 now introduced, and carefully raised to the surface ; 

 then, with any pointed instrument, display the 

 various parts, remove it from the water, complete 

 the setting out, place it between folds of bibulous 

 paper, and proceed as for other plants ; a piece of 

 calico laid over the specimens will prevent their 

 sticking to the paper. Corallines should be roughly 

 dried, like the larger sea- weeds. 



Parasitical Cryptogamic plants should be preserved 

 adherent upon a portion of the substance on which 

 they exist. 



