GENERAL CHAKACTEKS OF THE SPRAYS TESTED. 163 



included under the first twi) headings contain lime, while those under 

 headinos 8 and 4 contain none; all formuke containing 15, 20, or 30 

 pounds of lime to 45 gallons of water fall under the lirst head. Of the 

 18 sprays containing 4, 5, 8, and 10 pounds of lime, 10 fall under the 

 lirst heading and 8 under the second; copper sulphate enters into the 

 composition of 8 of the 10 sprays falling under the tirst head, while 

 the remaniing 2 contain iron sulphate; of the 8 sprays which fall under 

 the second heading, only 1 contains copper sulphate, and that l)ut 2 

 pounds, while 5 are sulphur spra\'s. 



These facts seem to show that the union of copper sulphate and lime 

 produces a spray possessing decidedly greater weathering qualities 

 than the union of sulphur and lime. 



In the following list are shown the pounds of lime contained in the 

 various sprays tested; the numbers of the rows of trees to which each 

 amount of lime was applied; the position of each spray as grouped 

 according to its apparent weathering qualities into classes 1, 2, 8, or 

 4; and references showing the nature^ of all the sprays containing lime: 



Weather-remtlng f/iialities of sprays. 



30 pounds lime in formula, class 1 , rows 1 t and Tf- 



20 pounds lime in formula, class 1, rows Sf, Of, 13t, 36t*, and 44°. 



I.'? pdiinds lime in formula, class 1, rows 15*, 33*, and 571. 



10 ])<)un(ls lime in formula, class 1, rows IHf*, 19t*, 41*, 4")*, 5()tt, 54* and SHttt; 



class 2, rows ()t, 12t, and 48t°. 

 8 pounds lime in formula, class 2, row lOf. 

 5 pounds lime in formula, class 1, rows 21*, 22*, 25*; class 2, rows 28*, 42t°, and 



51t. 

 4 pounds lime in formula, class 2, row lOf. 

 No lime in formula, cla^s 3, rows 27 and 35; class 4, rows 30, 32, 38, 39 and 47. 



t Sulphur and lime, or sulphur, lime, and salt. 



t* Copper sulphate, sulphur, and lime. 



° Lime. 



* Copper sulphate and lime. 



tt Iron sulphate and lime. 



ttt Iron sulphate, sulphur, atid lime. 



t° Potassium sulphide and lime. 



It may be well to state in connection with the above list that while 

 all the sprays not containing lime are classed under the third and 

 fourth heads, this arrangement may not correctly represent their 

 respective enduring qualities. As they are without lime, the eye can 

 not detect their presence in many cases where it is possible the chemi- 

 cals may really be present in effective quantity, and it is therefore 

 apparent that the value of such a list is largely of a comparative 

 nature among those sprays containing more or less lime in various 

 combinations. 



The general facts appear to be, as already indicated, that the copper 

 sprays are more enduring than the sulphur sprays, considering pound 



