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PREFACE. 



21 AVAIL myself of the last opportunity which I 

 ^-^ shall have for a word with my readers to add 

 a point or two to what will be found on /. 4, et seq., 

 of the "Introduction," concerning the method of this 

 book. I have attempted to make a book which 

 should be a real and helpful guide to those, who, 

 though not expert botanists, and not having, or using, 

 any aids to a good pair of eyes other than a simple 

 pocket magnifier, desire to begin the collection and 

 study of marine plants. I have been obliged, there- 

 fore, to resort to many devices for making the novitiate 

 see for the first time in these plants what is so 



