TlIH PoTATn I.\ IlKITISII ( '< >I.I M UIA. 7~) 



of water and kept ready for use. A small portion of the Bordeaux mixture is takeii 

 out in a saucer or any other vessel and a few drops of the ferrocyanide solution added, 

 or the latter may he added carefully drop by drop to the mixture in the barrel. If 

 the Bordeaux mixture is. properly made no change of colour will result. If there is 

 any free bluestone present a coppery-brown colour will be produced. This means 

 that more liine must be added until the ferrocyanide produces no reaction. Ready- 

 made Bordeaux mixture can be purchased. This generally costs much more than 

 the home-made article and is usually inferior in quality. 



BURGUNDY MIXTURE. 



This has been much used in Ireland and is convenient, especially if good lime 

 is dillieult to obtain. It is made like Bordeaux mixture, except that sodium-carbonate 

 crystals (sal sothi; washing-soda) are substituted for the lime, 6 Ib. of sal soda being 

 equivalent to 4 Ib. of quick-lime. Burgundy mixture is an almost transparent liquid 

 which sprays very readily. The proportions given must be adhered to, although 

 the actual quantity used may Tie varied as with Bordeaux mixture. The ferrocyanide 

 test is of no use^with this mixture. 



ACKNOWLEDGMENTS. 



In the preparation of this bulletin the writer is very much indebted to Mr. J. W. 

 Easthain, B.Sc., Plant Pathologist, for his valuable assistance in furnishing descrip- 

 tions of the potato-diseases, together with information regarding spraying and spray 

 mixtures, also notes on the botanical characters of the potato. 



Hearty thanks are extended to Mr. R. H. Helnier, of the Suinmerland Experi- 

 mental Farm, for information on irrigation, and to Mr. W. Downes, Dominion 

 Entomologist for Vancouver Island, for notes on the potato-insects. 



Acknowledgment is further due and gratefully given to Mr. William Newton, M.S., 

 and Mr. W. II. Robertson, B.S.A., of the Provincial Department of Agriculture; to 

 Mr. L. Stevenson, M.S., Superintendent of Vancouver Island Experimental Farm;- 

 and to Mr. W. II. Lyne, Inspector of Imports, Vancouver, B.C., for their valuable 

 assistance. 



VICTORIA, B.C. : 



Printed l.y WILLIAM II. Cri.i.iN, Printer to (lie Kind's Must Excellent Majesty, 



1021. 



