80 



THE BOTANICAL MAGAZINE. 



[Vol. XXXin. Xo. 888- 



-Owing to a continuous slormy weather in the latter part 

 of autumn last year I coukl not get satisfactory accesses to the 

 ground at regular intervals. The first sporeliugs of Porphyra 



Fig. 1. View of tiie experiment block towaid the nortli, taken on September 6, 

 1917, wlien it was just completed. Tiie keeper of the station in beliind. 



1 could observe on the block side was on 13th of November. 

 The youngest of them were ovate bodies consisting of two 

 cells, but many were already monostromatic blades of con.^ider- 

 able size. It amply evidences that the spores got hold of 

 the substratum earlier than the said date. By the lack of 

 previous observations due to the above circumstance I am un- 

 able to give the exact time of the spore-attaching. The various 

 stages of development of the spores observed afford reason to 

 assume that the spores have attached to the substratum not 

 simultaneously but successively for several days, perhaps for a 

 few weeks. 



In the latter part of August this year, the experiment block 

 was thoroughly washed wMth sand and brush, as no trace of 

 organism could be left on it. Mr. Ikaki took the trouble of 

 examining the block once or trvvice a week after the middle of 

 October. lie carefully scraped various parts of the block with 



