liEroKT OF State Board of Horticulture. 89 



briskly. This should be kept up for at least an hour, or 

 until the mixture is of a deep blood-red color, and there is 

 but little free sulphur floating upon the surface. 



Plate 3 is reproduced from photographs of two simple boil- 

 ing vats. Fig. 7 is simply a "hog scalding" vat made of 

 "inch-and-a-half" lumber and with galvanized iron bottom. It 

 is eighteen inches wide on the bottom, twenty inches wide on 

 top, and ten feet long. The sides should project two or three 

 inches beyond the end and the galvanized iron of which the 

 bottom is made should project at each end six inches beyond 

 the sides, and then be turned up and fastened securely, thus 

 forming shallow troughs at each end which must be kept 

 filled with water to keep the ends from burning. 



These vats may readily be set up wherever there is a con- 

 venient water supply by simply digging a trench of the 

 proper dimensions, placing the vat over it and banking about 

 with earth to prevent the fire from reaching the wooden sides. 

 A better draft is secured by erecting a few feet of stove pipe 

 at the back end. If the vat is to be permanently located it 

 is of course preferable to mount it upon a brick arch. With 

 such an apparatus one can readily prepare the spray as fast 

 as it can be used by a power spraying outfit running two 

 lines of hose. 



If one possess a steam boiler the spray can be most con- 

 veniently boiled in a number of barrels or in large wooden 

 vats, the steam being conveyed to the bottom of the barrels 

 or vats. Thus liberated it not only boils the spray but keeps 

 it well stired the while, thus eliminating much of the drudg- 

 ery of stirring by hand which is incident to other methods. 



ENEMIES OF THE SAN JOSE SCALE. 



At present I can offer no encouragement to those who de- 

 sire to see the San Jose scale held in chefck by its natural 

 enemies. In August, 1903, I received through the courtesy 

 of Dr. L. 0. Howard, a small consignment of the Chinese 

 Lady-bird Beetle (Chilocorus similis.) These were liberated at 

 Jacksonville, Oregon, in an abandoned pear thicket, on the 

 premises of Mayor E. Britt. This thicket was badly infested 

 with scale, Mr. Britt undertook to see that it should not be 



