CONTENTS. 



Page 



Introduction 3 



Nature of disintegration of nets _ •'> 



Mechanical wear and tear 3 



Bacterial decomposition i 



Oxidation 5 



Coloring of nets 6 



Preservation of nets by tanning materials 7 



Cold tanning T 



Hot tanning 7 



Chemistry of tanning materials S 



Tanning materials used for fish nets 12 



Fixing or mordanting of tanned nets 13 



Cunningham's experiments 13 



Lindeman's experiments 15 



Bull's experiments 19 



Improved recipe for tanning nets 22 



Sununary of methods of preservation of nets by tanning 24 



Preservation of nets by methods not dependent on tanning materials 25 



Linseed oil 25 



Tar 26 



Cunningham's further experiments 28 



Preparation of samples 28 



Shrinkage caused by preserving 29 



Creosote, smoke, etc 30 



Copper sulphate 31 



General comments 33 



Care of nets " 33 



Conclusion 34 



Citation of literature 34 



2 



