Cooperative Spraying Experiments. 



173 



sis of these limes showed from 28 to 38 per cent of magnesia, and the 

 quickUme varied from 40 to 60 per cent, the remainder being largely 

 water. One sample was the " limoid," now recommended for making the 

 kerosene-lime mixtures. Another sample was designated as " freshly- 

 burned, fine-ground lime," which would not keep more than three or four 

 weeks in this condition, as it would then begin to air-slake. Another 

 sample, which was said to be five years old, had practically all air-slaked, 

 and could not be used in making Bordeaux mixture, as will be shown later. 

 All of these " new-process " limes were tested beside a good stone lime, 

 and also with the best stone finishing lime I could get. The test consisted 

 simply of making a Bordeaux mixture with the various limes according 

 to the formula of five pounds of copper sulfate, five pounds of lime, and 



Fig. 46. — Cylinders of standard Bordeaux mixtures one hour after making. 

 Detailed description in paragraph beloiv. Black lines across the first five cyl- 

 inders indicate levels to which the mixtures had settled after standing three 

 hours. 



fifty gallons of water. Small batches were made up and poured into tall 

 glass cylinders and allowed to settle for various periods. 



In Figs. 46 and 47 are shown the results of these tests after the 

 mixtures had stood in the cylinders certain definite times. A was made 

 with the best stone finishing lime (Canaan) ; B, with Seneca white, fine- 

 ground, unslaked lime ; C, with " limoid ;" D, with a brand of prepared 

 lime sold by a spray pump manufacturer; E, with Seneca white new- 

 process hydrated lime, which was five years old and had all air-slaked; 

 at G is shown Bordeaux wrongly made with a new-process lime in which 



