No. 512] 



THE NEW FLORA OF KRAK 



bacteria, collecting: from several places 

 which were placed in sterilized tubes, 

 amined by Dr. E. De Kruyfr", bacteriolc 

 cultural Department at Buitenzorg, a 

 found to contain the usual proportion o' 

 both ordinary soil bacteria and putrefff 

 interesting discovery was the presence 

 nitrogen-fix ing bacterium, which was i 

 kniktitaui. />. mdicicola is present in 

 root tubercles of the numerous legumin 

 now abound on the island. It is evider 

 ent kinds of bacteria must have very e= 

 foothold upon the sterilized island suri 

 doubt among the factors which rende" 

 ment of the higher types of vegetation 

 A most interesting find was a sing 

 specimen of Ct/cas circinalis. This t 

 nearly two meters in height, and the 

 suggested that it was a survivor of the 

 Ernst states that this is impossible, as 

 island where it is growing belongs 1 

 formed since the eruption. 



Agents in Distribute 

 Ernst has treated very fully the ques 

 by which most of the members of the r 

 troduced (pages 53 to 68). There see 

 the earliest immigrants — bacteria, blue- 

 and mosses, were wind borne, and the 

 true of the first phanerogams found upc 

 posites and grasses, but other agents hi 

 transporting seeds and fruits to the si - 

 tated island, and of these the ocean c 

 ably been most important. There is n 

 fruits and seeds of the strand plant; 

 water borne, and Ernst called attentio 

 part played by driftwood in introd 

 whose seeds might have been lodged in 



