would not have any evil effect upon these plants, even in the 

 tender condition in which they are to be found in the spring- 

 time. This opinion was throughout the experiments com- 

 pletely confirmed, as in no case has there been any complaint 

 of damage done to young clover or grasses. 



The accompanying illustration shows three pots contain- 

 ing red clover, mustard, and wheat respectively. All three 

 sprayed while quite young with equal quantities of a 12 per 

 cent solution of Sulphate of Iron, the quantity applied being 

 greatly in excess of that which is used in ordinary practice. 

 As will be seen from the illustration neither the clover nor the 

 wheat was injured, whilst the mustard was entirely destroyed. 



VII. COMPARATIVE EFFECT OF SULPHATE OF 

 IRON AND SULPHATE OF COPPER 



In our trials Sulphate of Iron was for the most part em- 

 ployed. It is less inimical to plant life than Sulphate of 

 Copper, indeed it has been often applied as a fertilizer. The 

 advantages attending the use of Sulphate of Copper lies in the 

 fact that a much less weight of it is required, and it is much 

 more pleasant to use. The difference in the cost per acre is 

 not a serious consideration. Sometimes the one cost more per 

 acre than the other, depending upon the market. When large 

 crystals of either salt are used it takes a considerable time to 

 get a solution, particularly when a strong one is desired. The 

 difficulty may be overcome by having it well ground, but in 

 the form of a powder Sulphate of Iron rapidly oxidizes, and 

 on being dissolved produces a flocculent precipitate of the 

 hydrate of iron, which, however, does not cause a stoppage of 

 the nozzles. The particles of this precipitate very quickly 

 became white on the plant, but did not do any damage either 

 to the charlock or corn. 



VIII. COMPARATIVE EFFECT ON CHARLOCK 

 AND RUNCH 



As is well known to farmers in Yorkshire, there are two 

 weeds infesting corn fields, charlock and runch, which some- 

 what resemble each other. The charlock has a yellow flower, 

 while .the petals of the runch are whitish, with violet vein, and 



