(1) Two pounds of vitriol (copper); (2) four pounds of lime, fresh slaked; (3) twenty-seven gallons of water; (4) two pounds of sugar. (1) (2) and (3) should be mixed together till no longer blue, but clear. Then mix the sugar with the rest. Syringe with an insecticide every week in the early afternoon. The syringing should be done quickly and finely. The ordinary garden syringe with a fine rose does quite well.
Here is the real Bordeaux mixture, slightly different from the last receipt, used throughout the whole of France against the phylloxera on the Vines; it is also a cure for the Potato disease: