26 TREATMENT OF THE COARSER SPECIES. 



between two layers of tin-foil, or, what is still better, a 

 portion of the thin leaves of gutta percha ; then placed 

 in an envelope, and despatched by post, without any 

 unnecessary loss of time.* 



Though the method I have just described may be 

 generally adopted with the larger portion of Algse, there 

 are some particular species that require a different mode 

 of treatment in laying out for the purpose of being 

 dried, which I will now proceed to describe. 



Most of the Melanospermese, or olivaceous series, 

 give out a large quantity of mucus, after being im- 

 mersed in fresh water, which renders it difficult to 

 preserve good specimens in the ordinary way, from their 

 adhering tenaciously both to the cloths and the paper. 

 Amongst these, I may notice all the different species 

 of Fucoidese, Chorda Filum, Cystoseira, Halydrys sili- 

 quosa, Pycnophycus tuberculatus, Chondrus crispus, and 

 others of similar texture. All the plants thus enume- 

 rated require to be treated in a particular manner, and 

 differently from others. 



Instead of attempting to display them immediately 

 after being gathered, it is best to spread them out on 



* In this manner, I am frequently in the habit of trans- 

 mitting recent specimens to Professor Harvey, of Trinity 

 College, Dublin ; Mrs. Griffiths, of Torquay ; and other 

 correspondents : and I find they generally arrive in excel- 

 lent condition. 



