96 



FOOTNOTES FROM 



seasons. Goats, and especially deer, are fond of it ; 

 and in winter, when other food is scarce, they hardly 

 leave a vestige of it on the trees within their reach. 



FlG. 12. USSEA FLORIDA. 



The tortoises of the small rocky islands of the Galapagos 

 Archipelago subsist almost entirely upon it. 



But it is not to animals alone that lichens furnish a 

 supply of food. Man himself is 

 frequently directly indebted to 

 them for a subsistence. There 

 are few, I presume, who are not 

 acquainted with some particulars 

 regarding the history and uses of 

 that remarkable lichen, sold in 

 chemists' shops under the name 

 of Cetraria fslandica, or Iceland 

 moss (Fig. 13). Although in 

 this country it is only used medi- 

 s. CETRABIA ISLANDICA. cinally, as a restorative diet in 

 exhausting diseases, and during convalescence, for which 

 it possesses an immemorial reputation ; it forms the 



