2 



such as the movement of surface waters caused by preva- 

 lent winds. The Prince of Monaco started a few years 

 ago the system of distributing over the North Atla,ntic 

 large numbers of small floating copper vessels, with the 

 object of finding out where they drifted to. This plan we 

 have adopted, with slight modifications, and in September 

 we started the distribution of what may be called " drift 

 bottles" over the Irish Sea. A small, strong, buoyant 

 bottle, measuring 7*5 cm. by 1'8 cm., which seemed well 

 suited for the purpose, and which costs only 7s. per gross 

 was selected. A notice was drawn up, as follows, to go in 

 the bottles, and a large number of copies were printed and 

 numbered consecutively. 



Any one who finds this is earnestly requested 

 to write tlje place, and date when found, in the 

 space (on the other side) for the purpose, place 

 the paper in an envelope, and post it to 

 Professoe Herdman, 



University College, 



Liverpool. 



No 



Postage need not be prepaid. 



Turn over. 

 [other side.] 

 Please write distinctly, and give full particulars. 

 Locality, where found 



Date, when found 



Name and address of sender. 



A paper was then placed in each bottle, so folded that 

 the number could be readily seen through the glass, the 



