FORTIETH ANNUAL REPORT. 67 



When we buy lime promiscuously upon the market we have no idea 

 of what we are getting. It may be good lime or it may be poor lime. 

 We have no way of telling unless we make the manufacturer of the 

 lime guarantee what it contains and then from that guarantee we can 

 determine the amount which we must use in order to furnish the proper 

 amount of calcium oxide. 



When we make a solution of lime and sulphur whether Ave use a 

 good grade of lime, one containing a high percentage of calcium oxide 

 or not, we will get more or less of sludge or sediment. Now the ques- 

 tion comes up, is it necessary to separate the solution from the sludge 

 when we wish to store it for a period of a few weeks or months before 

 using. It is often very much more convenient to make up this lime sul- 

 phur solution in the winter because when the time comes tO' use it we 

 Avant to spray and do it quickly. There are so many other things on 

 hand in the spring that we do not have as much time to spend in making 

 this solution as we would like and for this reason many orchards do 

 not get the benefit of spraying that they should or would if the solution 

 could have been put on the trees at just the right time. If we can 

 make this up during the winter and set it aside you see we have that 

 work out of the way before we begin to spray. The question arose 

 whether this solution could be stored over the sludge Avithout impairing 

 its quality so we took this up in our studies last summer. For this 

 purpose samples of lime sulphur solution containing sediment were 

 set away for periods varying from d to 6 weeks and as a check filtered 

 samples of the same solution Avere stored under the same conditions. 

 The results are giA^en in table V. The analyses designated by the let- 

 ter A were made on the solution when it was first prepared, those des- 

 ignated by the letter B represent the solution stored over the sediment 

 and those designated by the letter C represent the stored, filtered solu- 

 tions. I ' 



