TOs Volume is Inscribed 



"WITH GREAT RESPECT, TO THE MEMORY OF THE LATE 



DR. GEORGE JOHNSTON, 



OF BERWICK-ON-TWEED, 

 AN ENTHUSIASTIC AND TALENTED OBSERVER AND WRITER ON 



NATURAL HISTORY; 



WHOSE NUMEROUS WORKS ON BOTANY AND MARINE ZOOLOGY, AND ESPECIALLY 



ON THE SPONGES AND ZOOPHYTES OF GREAT BRITAIN, 



HAVE POWERFULLY AIDED IN THE DIFFUSION OF A TASTE FOR 



THE CULTIVATION OF THOSE SCIENCES. 



