20 FUMIGATION OF APPLES FOR SAN JOSE SCALE. 
ber 26, 1906, a few scales on one apple in No. 26 were regarded as 
doubtfully dead, and hence were classed as alive; and upon the second 
examination, December 14, six insects on one fruit and one on 
another were also doubtful. : 
In experiment No. 28 an iron screen “header” was used in the 
lower end of the barrel, the top not being removed. This header, 
devised by Mr. S. J. Dennis of Field Investigations in Pomology, as 
shown in figure 3, consisted of a circular framework of strong iron 
strips, somewhat smaller than the barrel head, to which was attached 
a semicircular piece hinged along the middle, fitting over one-half of 
the frame beneath, and firmly held by a locking device on the rim, 
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Fia. 3.—Special barrel ‘‘ header” for replacing lower barrel head in fumigating directly over discharge 
box. (Original.) 
The header, with screened surface turned inward, when pressed 
in place fitted the head tightly and firmly held the apples in their 
original positions, and permitted free access of the gas. This barrel 
when fumigated had been one and one-half hours from cold storage 
and the fruit was thoroughly wet from condensation of moisture, the 
temperature of fruit being 1.5° C. On account of scarcity of scale 
insects, only one examination was made, December 26, 1906, the 
fruit examined being taken from the top, middle, and bottom of the 
barrel. Of the 1,662 scales examined, one from an apple in the center 
of the barrel was regarded as doubtfully dead. No injury to the fruit 
was subsequently noted, despite the presence of the moisture. 
