Pr eee ae NT ee ane eel en 
Geology and Natural Histury. - 257 
and several appeared in a reduced form in the Annales des Sciences 
of 1851 as illustrations of his article “ Recherches sur les Zods- 
of fifty plates, but, at the time of his premature death, ten of the 
plates had not been engraved. These were finished under the 
direction of his friend and co-worker, Dr. Bornet. Never before 
t is, however, : ver} 
exposition of the structure and reproduction of the different groups 
of alge. The principal part of the observations on the Fucacewe 
reproduction in the Corallinee throws a new light on the struc- 
ture of that order; and for the first time a detailed account is 
given of the antheridia and cystocorpic spores. ; a. F 
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Tokio, Japan, November 26, 1878. 
