merits with large "drift" bottles. These, and also his 

 observations upon young stages of the Eel, are given 

 below^ m separate sections. In addition to Mr. Scott's 

 own v^^ork at Piel we have a first report from Messrs. 

 Gamble and Keeble, Demonstrators of Biology at the 

 Owens College, Manchester, upon the interesting work 

 that they were conducting at Piel during a considerable 

 portion of last summer. 



In one of his letters to me at the beginning (June) oi 

 the research Mr. Gamble says: "We hope by the end 

 of summer to have some sound experimental evidence oi 

 the nature of colour change in Virhius and possibly in 

 Mysis as well. . . . Our apparatus consists partly ol 

 an arrangement for maintaining a constant stream of 

 water through a series of observation vessels and partly 

 of an arrangement by which air is sucked through a 

 second set of vessels. Thus we can determitie whether 

 change of air or change of water is the most conducive tc 

 health. Then in addition to a dark box we have a series 

 of ' light-filters ' by means of which we can obtain the 

 influence of monochromatic light on Virhius both in the 

 above-mentioned vessels and under the microscope. 

 . . . . For exact physiological work, the sea-watei 

 and gas laid on in the Laboratory at Piel are an immense 

 advantage — to say nothing of the excellent accomnioda- 

 tion, and from what we managed to do a few weeks age 

 both Keeble and I hope that before the end of September 

 we may have settled some important questions in 

 connection with the colour-reactions of Crustacea to 

 various stimuli." For further particulars I refer to the 

 authors' report given below (p 81). 



This work has, at present, no obvious connection with 

 economic fishery problems, but it is impossible to foretell, 

 in these days of rapid advance in discovery, and in the 





