~ 393 ~ 



XXXIII. 



Antiparasitic and Insecticide preparations. Spraying: contri- 

 vances and implements for combating parasites and pests. 



- Frauds in the sale of such preparations and measures 

 for controlling their trade. Legislation regarding the sale 

 of insecticides and similar preparations. Legislation re- 

 garding plant diseases and pests. Legislation against weeds. 



- Protection of plants against wanton destruction. 



The DUKE OF BEDFORD and S. N. PICKERING. Fungicides, Ge- 

 neral Remarks. Copper Fungicides Classified. Previous 

 Work on Fungicidal action. Previous Work in Bordeaux 

 injury. The Question of Solvent Excretions. Absorption 

 of Copper by the Leaf. Experiments on Scorching and 

 Fungicidal Action. Eleventh Report of the Woburn Experi- 

 mental Fruit Farm, 1910, pp. 1-190; See also previous studies; 

 PICKERING,/^. Agr. Science, October 1909, and Journ. Chem. 

 Soc. Trans, 1907, 91, 1988. 



In the introductory part of this publication the Authors state plainly 

 that " any attempt to reduce the present report into the form of a 

 popular treatise, adapted for the reading of the average fruit grower, 

 would be a failure, for it deals with the nature and action of copper 

 fungicides, a subject which can not be investigated without dipping 

 somewhat deeply into a number of intricate chemical questions." The- 

 refore keeping in mind that the practical outcome of such scientific 

 investigation work, is the part particularly interesting to the greater 

 number of fruitgrowers and farmers all over the world, special 

 attention will be paid to the practical conclusions, since it is only 

 by means of the present researches of Prof. Pickering that the 

 character of the substance constituting the familiar Bordeaux mix- 

 ture has been elucidated. 



The chemistry of all the changes, copper compounds undergo 

 when in use, will, in the proper form, be appreciated in the Au- 

 thors' original report. 



