1915 



Fallisj on Nereocystis 



It was interesting to note the growth of that part of the frond in 

 which there were reproducing patches. Since it is concluded that the 

 greatest growth is in the basal two or two and a half feet, and the re- 

 producing patches seldom occur near the base of the frond, little growth 

 takes place in that portion. Several fronds containing reproducing patches 

 in various stages of development were marked, and results show growth 

 there the same as in any other frond up to the time when these patches 

 are about ready to drop out. About that time the frond appears to cease 

 growing in the reproducing region and beyond, and often becomes torn. 



Another frond was now seleced that was seven and one fourth feet 

 long. This was marked by small holes punched down the center of the 

 frond three inches apart, and the spaces between the holes measured from 

 time to time. When it was found that this scheme worked out all right, 

 the same experiment was performed on nine other healthy mature fronds 

 taken from different plants, to verify the first results. Table 4 shows 

 the average growth in inches of the ten laminae in each successive 3-inch 

 portion, beginning at the base and numbered from one to twenty-seven. 

 The measurements were taken two days apart, beginning July 19. It 

 will be observed from the table that most of the growth occurs in the 

 basal two feet; that nowhere beyond two and a half feet is the increase in 

 the twelve days more than half an inch. The place of greatest growth is 

 the second three inches, showing an increase of fifteen and a half inches. 



Table 4. Showing in what part of frond there is the greatest growth. 



*No change observed. 



The same result will also be observed in Table 5, which gives the 

 results of the growths in a frond two and a half feet long marked down 



