MARINE BIOLOGICAL STATION AT PORT ERIN. 



35 



Professor Harvey Gibson and Dr. Reynolds Green com- 

 menced last year a series of experiments in our open-air concrete 

 tanks and in a part of the spawning pond, on the toxicity of 

 certain compounds to algal gonidia, and the conditions of their 

 germination on various substrata. These have been continued 

 during the present season, but the results are not sufficiently 

 far advanced to warrant publication. 



Mr. Burfield has started work on the remarkable pelagic 

 " Arrow-worm " Sagitta bipunctata (fig. 5), with the object of 

 producing an L.M.B.C. Memoir on the subject. He was mainly 

 occupied at Port Erin in collecting and preserving material 

 from the plankton collections, and in recording the statistics of 

 distribution. 



Fig. 5. The Arrow-worm, Sagitta bipunctata . 



[Photo by Mr. A. Scott. 



Mr. H. G. Jackson, M.Sc, acted as my Assistant in the 

 plankton investigation from the yacht during the Easter 

 vacation. The results obtained will be given in full in the next 



