REV.IEW. 411 



the genus Caulerpa,^ the only portion of the Chloro- 

 SPERMS that has yet appeared. It is to be hoped, but 

 perhaps scarcely to be expected in the present state of our 

 knowledge of this large class of Alga?, that another volume 

 containing the whole of the Chlorosperms will soon follow 

 the present. Such a work is known to have been long in 

 hand, but Professor Agardh is not one who hurries in the 

 execution of his work, but who seeks above all things to do 

 that work accurately and thoroughly. In the present 

 state of uncertainty which prevails regarding the affinity 

 between the Algae and Lichens, wise men are cautious in 

 expressing opinions which may or may not prove to be 

 supported by facts. 



Mary P. Merrifield. 



' '• Till Algernes Systeraatik. NyaBidrag af J. G. Agardh,'' ' Lunds Univ. 

 Arsskr,' torn, ix, 1872. 



VOL. XVT. NEW SER, D D 



