191 1.] Bordeaux Mixture for Potato Disease. 229 



market with his freedom of choice considerably hampered, 

 and, in order to obtain a sufficiency of albuminoids, may find 

 it necessary to purchase the relatively more expensive foods. 

 It will, indeed, rarely be economical to buy foods rich in 

 carbohydrates and correspondingly poor in albuminoids (e.g., 

 maize) except as substitutes for home-grown grain for the 

 purpose of blending with other foods rich in albuminoids. 



Again, the farmer may be so convinced of the superior 

 merits of some particular food, say linseed cake, as to be 

 willing to pay more for it than its composition alone would 

 warrant ; or, on the other hand, the demand for certain other 

 foods may, owing to prejudice or other reasons, be so unsatis- 

 factory, or the supply so excessive, as to cause the merchants 

 to offer them at prices which are lower than their composition 

 would seem to justify. 



It is, therefore, desirable to select as a standard for purposes 

 of comparison some foodstuff in common use the price of 

 which is little subject to such abnormal influences, and is 

 reasonably steady. In the examples given in the preceding 

 pages linseed cake was used as the basis of comparison. The 

 values arrived at for the other foods will err therefore, if at 

 all, rather upon the high than upon the low side, since the 

 general popularity of linseed cake always assures for it a 

 relatively high price. At the present time Egyptian cotton 

 cake usually serves as an excellent basis for the purposes of 

 comparison. 



The Board of Agriculture and Fisheries desire to draw the 

 attention of potato growers to the importance of spraying their 

 crops with Bordeaux mixture as a pro- 

 Spraying with tection against potato disease. 

 Bordeaux Mixture T , 

 for Potato Disease. In wet seasons spraying is of great 

 value, while even in dry seasons when 

 no disease is apparent the treatment is found to be beneficial, 

 producing a longer period of growth and an increased yield. 



The crop should be sprayed twice, and the first spraying 

 should take place as soon as there is a good development of 

 haulm, towards the end of June or early in July, according to 

 the locality and season. About three weeks later the treatment 

 should be repeated. 



