COPPEE FEEROCYANIDE, 269' 



bouillie adheres better than ammoniacal bouillie bourguignonne. 

 Galloway treated summer wheat and oats against rust by making four 

 sprayings with this bouillie, 6, 16, and 20 June, and 5 July. He 

 obtained plots of wheat with no rust, and yielding 9 units of grain 

 against 8-5 on the untreated plots. With a bouillie containing more 

 borax — it consisted of 70 grammes of blue vitriol and 180 grammes of 

 borax in 100 litres of water— he obtained on winter wheat fields free 

 from rust by spraying every ten days. 



95. Ferrocyanide of Copper. — Preparation. — By adding a solu- 

 tion of yellow prussiate of potash to one of blue vitriol, until all the 

 copper is precipitated. 



Use. — Galloway tried to overcome the rust of winter wheat by 

 spraying the wheat fields every ten days with this preparation. He 

 used a bouillie of 7 oz. of blue vitriol and 16 oz. of yellow prussiate 

 in 62^ gallons of water. By this treatment he diminished the 

 diseased plants 30 per cent. A bouillie consisting of 4 oz. of blue 

 vitriol and 6 oz. of yellow prussiate used in four sprayings, 6, 16, and 

 20 June, and 5 July, has considerably increased the yield of summer 

 wheat and oats. If fell to 7 units against 8-5 on untreated plots. 



