THE HERBARIUM. 379 



We will now suppose the collector to have returned 

 from the shore, laden with the spoils of a recent storm, 

 in the shape of some finely-fruiting specimens of the 

 various species of Delesseria, PolysipJionia, CalUthamniony 

 or allied genera. After supplying himself with a suffi- 

 ciency for drying, he will have as many fragmentary portions 

 left as will make a number of preparations. 



He is now ready to try his hand at mounting these, and 

 we proceed to give briefly a few directions, referring such as 

 would be proficient in the art for further details to Quekett^s 

 admirable work on the microscope, and also articles on the 

 subject in the Annals and Magazine of Natural History for 

 IVbruary and April 1845. The first mode we mention is 

 one to which we have not yet referred, inasmuch as no 

 barrier cell requires to be raised for confining the fluid. 

 Some of the Callithamnions, and allied genera, whose deli- 

 cate branchlets are thin as the " web of the gossamer loom,^' 

 require no cell with raised walls. All that is necessary is 

 to touch one of the thin glass covers — previously carefully 

 cleaned — all round with varnish. The delicate object having 

 been laid on the surface of the glass slide, with the necessary 

 quantity of preserving fluid, the glass cover is carefully 

 dropped over it. As the varnish repels the water, none but 



