FORTIETH ANNUAL REPORT. 



69 



is made according to a formula calling for an excess of lime there 

 is liable to be a very considerable deterioration in llie solution when 

 ke])t in contact with the sediment for any length of time, even when 

 stored properly. 



The sediment possesses no insecticidal or fungicidal value although 

 it is sometimes beneficial in serving as a marker during the spraying op- 

 eration. In purchasing commercial solutions it would be poor econ- 

 omy therefore, to buy a solution containing sediment and pay lime- 

 sulphur i>rices for the comparatively worthless sludge. 



It 'has been recommended that lime-sulphur solutions which have 

 been allowed to cool should be re-heated before using. In order to deter- 

 mine whether or not there is a distinct advantage in doing this samples 

 3, 4 and 8 of the above experiment were used. In sample 3 and 

 8 the excess of sulphur in the sediment was large; in sample 4 the 

 excess of sulphur was small. 



The analyses corresponding to the numbers 3B, 4B and 8B repre- 

 sent the samples that have stood for several weeks in contact with 

 the sediment. The analyses corresponding to the numbers 31), 4D and 

 8D represent portions of the same samples that have been re-heated nearly 

 to boiling in contact with the sediment. 



Table V. 



In the first two samples there is a slight increase in total snl]»hur and 

 also in sulfide suljihur in the samples thai have been reheated but the 

 increase is so small that we may safely conclude that there is no advantage 

 to be gained by re-heating the solutions before using. The increase in 

 soluble sulphur will not pay for the labor and fuel used. 



Now these are some of the practical points which we took up in 

 our studies of the lime-sulphur- solutions this summer and as there 

 are perhaps some questions in the minds of some that have not been 

 touched ujion, I would like for the remainder of the time to be given to 

 the asking and answering of questions. 



I want to say, however, that you can probably ask many questions 

 which I cannot answer. A man can work over this problem for years 

 without learning everything there is to be known about it. Everybody 

 who has attempted to work on the lime-sulphur solution and the chem- 

 istry of it is still in the dark in regard to a great many points: I 

 will say, however, before going on, that the results of our exiieriments 



