Puget Sound Marine Sta. Pub. 



Vol. 1, No. 1 



the center with holes one inch apart. The fronds observed in this experi- 

 ment show no growth beyond twenty-six inches, while in the first experi- 

 ment a very slight increase was observed almost the full length of the 

 frond. 



Table 5. Showing growth in each successive inch of frond 2.5 feet long. 



*No change observed. 



Since pieces three inches long cut from a frond were found to grow, 

 experiments were attempted to find how short the pieces could be cut 

 and still grow. Consequently pieces varying from two inches to one fourth 

 of an inch were cut from fronds about three inches above the base, and 

 tacked to the raft. In each piece, for the few measurements that could 

 be taken, a slight growth was observed. This was also true of other 

 pieces that were cut from the center of the frond ; some of these were 

 cut half an inch long and a quarter inch wide, and some a quarter 

 inch long and half an inch wide. Tables 6 and 7 show three successive 

 measurements of these pieces. 



Table 6. Showing growth in i)iches of small pieces of fronds with natural 



margins. 



