108 MASS. EXPERIMENT STATION BULLETIN 252 



2. So-called "soluble copper" is not a criterion of fungicidal activity, 

 ar. various organic compounds produce filtrable copper, the activity of 

 which is lower than that of soluble inorganic compounds which are readily 

 ionized. 



3. Suspension, although largely dependent on dispersion, may be in- 

 creased in a measure by supplementary products. This is likewise true 

 of wetting, spreading and adhesiveness. 



4. Protectors may retard the formation of larger aggregates, crystal- 

 lization, decomposition and the interactions between non-compatibles. 



5. Of the various supplements tested by the Massachusetts Experiment 

 Station, wheat flour, glue (or gelatine), soap and tannic acid are promising 

 in that they seem to increase the efficiency of the spray in more than one 

 aspect. 



Literature Cited 



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Sta. Rpt. 15, Bui. 2:17-108. 



2. Bedford, Duke of, .\nd Pickering, S. U. 1908. Emulsions. Woburn 



Expt. Fruit Farm Rpt. 8:18-32. 



3 AND Pickering, S. U. 1910. The action of copper in different 



states of combination. Woburn Expt. Fruit Farm Rpt. 11:125-129. 



4. Berger, E. W. 1917. Linseed oil Bordeaux. Fla. State Hort. Soc. 



Proc. 30:44-47. 



5. BoijRCAUT, E. Trans. T. R. Burton. 1925. Insecticides, fungicides and 



weedkillers. Ed. 2, 431p., illus. London. 



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deterioration of cattle-dij)ping fluids. Queensland Agr. Jour. New 

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7. Butler, O. 1914. Bordeaux mixture. 1 Physico-chemical studies. Phy- 



topath. 4:125-180. 



8 1914. Notes on the preparation of Bordeaux mixture. N. H. 



Agr. Expt. Sta. Circ. 15. 

 9. 1923. Chemical, physical and biological properties of Bor- 

 deaux mixtures. Indus, and Engin. Chem. 15:1039-1041. 



10 AND Smith, T. O. 1919. Relative adhesiveness of the copper 



fungicides. Phytopath. 9:431-444. 



11 AND Smith, T. O. 1922. On the use of copper acetates as 



fungicides. Phytopath. 12:279-289. 



12. Cazeneuve, p. 1898. La bouillie bordelaise albumineuse. Vigne France, 



No. 4:51-53. Rev. Vitic. 9:279-280. 



13. Chappaz, G. 1913. Les bouillies mouillantes. Prog. Agr. et Vitic. 



59:487-491. Bui. Agr. Algerie et Tunisie, Maroc. 19:187-191. 



14. Chuard, E., and Porchet, F. 1905. L'adherence des bouillies cupriques. 



Rev. Vitic. 24:33-37. 



15. Chauzit, J. 1913. La bouillie bordelaise mouillante et adherente. Rev. 



Vitic. 39:764-766. 



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with special reference to Bordeaux mixture. Bot. Gaz. 33:26-48. 



17. Cooper, W. F., and Nuttall, W. H. 1915. The theory of wetting and 



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 containing a soap basis. Jour. Agr. Sci. [England] 7 ( Pt. 2) :219-239. 



