HANDBOOK OF SEA-WEEDS. 29 



added, and the mixture, after standing for a few days, to be 

 carefully filtered. 



For authorities on the morphology and classification of the 

 Algae, students may be referred to Sachs' " Text Book " and 

 Le Maout's " System of Botany," of which there are good trans- 

 lations, and the "Introduction to Cryptogamic Botany," by the 

 Rev. M. J. Berkeley; for descriptions and the identification 

 of species j to the text and figures of Harvey's "Phycologia 

 Britannica," and " Nature- Printed Sea-weeds." Both of these 

 are however costly. Among the cheaper works are " British 

 Sea- weeds," by S. O. Gray (Lo veil, Reeve & Co.), "Harvey's 

 Manual " and an abridgment by Mrs. A. Gatty, with reduced 

 but well executed copies of the figures, of the Phycologia. This 

 synopsis can often be picked up cheap at second-hand book- 

 stalls ; and there is a very excellent low-priced work suitable for 

 amateurs, Grattann's "British Marine Algae," containing re- 

 cognizable figures of nearly all our native species. Lands- 

 borough's "Popular History of British Sea- weeds," and Mrs. 

 Lane Clarke's "Common Sea- weeds," are also cheap and useful 

 manuals on the subject. 



