PRESERVATION OF PISH NETS 437 



linseed oil or paraffin, copper oleate is less effective as an antifouling 

 agent. 



In regard to the second and third suggestions, it has been found 

 from our experiments that a mixture of copper oleate and coal tar 

 makes an excellent jjreservative ; in fact, one of the most effective 

 tested. Where considerable increase in weight and stiffening is 

 objectionable, such a treatment, of course, would not be permissible. 

 This treatment would also eliminate the slipping of knots. 



These objections from the users of copper oleate are important. It 

 is believed, however, that if serious effort were made to overcome 

 them this could be done, at least to some extent. Work on these 

 problems is now being done. 



BIBLIOGRAPHY 



(This list contains only references not listed in our previous publications, except one by Olie specifically 



referred to in this paper] 



Atkins, W. R. G. 



1923. Factors affecting the durability of silk plankton townets and young- 

 fish trawlnets. Journal, Marine Biological Association of the 

 United Kingdom, new series. Vol. XIII, No. 1, December, 1923, 

 pp. 276-281. Plymouth. 

 De Puyster, Barrington. 



1923. Chemical properties of cotton; action of light. Color Trade Journal, 

 Vol. XIII, 1923, pp. 23-26. New York. 

 HoLMAN, H. P., and Jarrell, T. D. 



1923. The effects of waterproofing materials and outdoor exposure upon 



the tensile strength of cotton yarn. Industrial and Engineering 

 Chemistry, vol. 15, No. 3, March 1, 1923, pp. 236-240. Easton, 

 Pa. 

 Olie, J., Jr. 



1918. Verslag van der directeur van het Nederlandsch Visscherij-Proef- 

 station over het jaar 1917. Bijlage, Jaarverslag van het Visscherij- 

 Proefstation over 1917, No. 21, Mededeehngen en Verslagen van 

 de Visscherijinspectie. Uitgegeven voor rekening van het Depart- 

 ment van Landbouw, Nijverheid en Handel, 's-Gravenhage. 

 {See especially Voorschriften voor de behandeling van netten met 

 kopersulfaat en ammonia, pp. 40-42.) 



1924. TaancarboUneum. Appendix 10, Jaarverslag van het Nederlandsche 



Visscherij Proefstation over 1924, 6 pp. 



1925. Bescherming van het want tegen nettenvernielers: 1° door " Tanol," 



2° door Koperoleaat. Nederlandsche Visscherijproef station, Me- 

 dedeehngen, 1925, 11 pp. Utrecht. 

 1925a. Sur I'emploi du latex dans le traitement des filets de peche. OflSce 

 Scientifique et Technique des Peches Maratimes, Notes et M^- 

 moires, No. 47, 1925, 7 pp. Paris. 

 Waentig, p. 



1923. Uber den Einfluss des Lichts auf Textilfasern. Zeitschrift fur Ange- 

 wandte Chemie, Band XXXVI, 1923, pp. 357-358. Leipzig. 



o 



