24 



position, in lunnel-form, at the sliglitest motion of the wnter, aml when tlie seino 

 stops its progress across the bottom of the sea, it must coUapse and so prevent 

 the tish from escaping out of the bag; but tlie arms and the bag must be 

 stiff with coal-tar, so that they Avill always stand up and make no folds. 



Tlie fishermeu always employ heat for raaking the eoal-tar thin, before 

 the apparatus is dipped iuto it. According to my experience it is easier and 

 better to make it thin by mixing it irith creosofe-oil (carbolinium). The tar 

 can tlieu be used eold, and enters bettor into the strands. When, by much 

 use, the tar is worn away so fai- that the strands may become saturated 

 with water, the treatment must be repeated. To prevent wear and tear where 

 it is worn most, i. e. on the under side. of the bag, an extm piece, made of 

 yarn, is fastened to the outside, so that the bag here really becomes double; 

 but it is necessar}" to sew on this piece carefuUy, so that it does not prevent 

 the bag from taking its right shape in the water. — 



As pointed out above, it is not my opinioa that we shall rest satisfied 

 with tho here described apparatus for the investigation of the unknown seas; 

 but I have wished to point out a way which has not hitherto beea successfuliy 

 trodden by any explorer, and which makes it possible easil}^ to modify the 

 apparatus with due respeet to the various problems that are to be solved. 



