SEAWEEDS 



much lacerated, and should be collected at once to be 

 of any value, since exposure quickly spoils them. 

 The ordinary form of dredge used in securing 

 zoological specimens serves for seaweeds, but is 

 liable to become choked. Reinke's dredge, armed 

 with cutting teeth like spear- 

 heads surrounding the mouth, 

 has been found to be service- 

 able, and a simple contrivance 

 shaped like the letter A, with 

 strong fishhooks of the largest 

 size on strong cords attached to 

 the cross-bar, and the ends of the 

 legs weighted, has been recom- 

 mended, but requires skill and 

 judgment in its use. It is likely 

 to disappoint the experimenter 

 unless under very favourable con- 

 ditions. A light dredge can be 

 easily worked from a rowing- 

 boat, which is also sufficient for 

 no. i.-Reinke-s Dredge, tow-netting with fine silk nets 

 for the capture of the free-float- 

 The traveller who wishes to 

 examine the minute pelagic Algse from the surface 

 layers of the ocean can do so by obtaining permission 

 to tap an inlet pipe of a steamship, and allowing the 

 water to run through a fine silk bag for a time, when 

 he will be rewarded with results similar to those 

 from tow-netting. This method has been success- 

 fully practised by its inventor, Dr. John Murray, of 

 the Challenger expedition. 



ing minute Algse. 



