stead of clearing away all doubts he only served to introduce new 



Two years afterwards the question was again agitated by Agardh 

 and Dr. Greville^ of Edinburgh. Both these observers agreed in 

 every particular with Robert Brown. Sir William Hooker also, 

 the eminent naturalist and botanist, later confirmed the views of 

 Agardh and Greville ; but he named the "red snow" PaJmella in- 

 stead of Protocols nivalis Agardh. The algic nature of the 

 plant was thus decided for a time. 



During the year 1838 several observers on the continent, among 

 whom may be mentioned Kunze, Unger and Martins, wrote elabo- 

 rate monographs upon the subject, but without eliciting anything 



Thus far we have had to do only with believers in the vegetable 

 origin of the Protococcus. There are almost as many eminent 

 observers arrayed on the opposite side, who pronounce in regard 

 to its animal nature. 



In August, 1839, Mr. Shuttleworth, 4 an English resident of 



;ence of s 



In 1840, Prole 



