162 PEACH LEAF CURLt ITS NATURE AND TREATMENT. 



sulphur, and lime were tested in combination by adding to the sulphur 

 spray a mixture prepared by uniting the milk of lime with a solution 

 of iron sulphate. The union of the milk of lime with the iron sulphate 

 solution produced a lead-colored mixture resembling Bordeaux mix- 

 ture in consistency, and when united with the sulphur solution the 

 color was dark green or approaching black. Iron sulphate and lime 

 were also tested separately. 



While some of these sprays gave evidence of considerable fungi- 

 cidal action, none of them gave results which would warrant their 

 substitution for the sprays already considered in previous chapters, 

 and hence it is unnecessary to enter further into details respecting 

 their preparation. The results of their use may be learned in the 

 chapters of this bulletin which relate to the action of the sprays on 

 the foliage and the fruit. 



GENERAL CHARACTERS OF THE SPRATS TESTED. 



There are certain general characters of sprays adapting them or 

 makiner them unsuitable for various classes of work, and to these it 

 may be well to allude. 



THE ENDURING QUALITIES OF THE SPRAYS. 



In the worK here described careful notes were made on the enduring 

 or weathering qualities of the sprays tested. 



During the last week in April and first week in March, 1895, 35 

 sprays, of different formula, were applied in the experimental block 

 in the Rio Bonito orchard, most of them to 10 large trees, as has 

 heretofore l)een shown. On August 10, or five months after the 

 spraying was completed, the trees of each experiment row were 

 examined to ascertain as far as possible the enduring or weathering 

 qualities of the sprays, and according to the notes made at that time 

 the appearance of the sprays upon the trees, after five months' weather- 

 ing, may be grouped under the following four heads or classes: 



(1) Sprays showing quite distinctly upon the trees on August 10. 



(2) Sprays moderately evident on August 10. 



(3) Sprays little evident on August 10. 



(4) Sprays not observable on August 10. 



The sprays classed under the first head, were those applied to rows 1, 

 3, T, 9, 13, 15, 18, 19, 21, 22, 25, 33, 36, 41, 44, 45, 50, 54, 56, and 57; 

 under the second head, those applied to rows 6, 10, 12, 16, 28, 42, 48, 

 and 51; under the third head, those applied to rows 27 and 35; and 

 under the fourth head, those applied to rows 30, 32, 38, 39, and 47. 

 By referring to page 73 the reader will find a table giving the formula 

 for sprays applied to each of the rows named, and an examination of 

 these formulae will bring out the following facts: All the sprays 



