. Fumigation dosage. the dimensions usually given by writers on fumigation, butare not the measurements most easily made. The writer suggested, inBulletin No. 122 of this Station, the two measurements that wereemployed in getting the data upon which this study is based. Thesemeasurements are indicated by c, circumference, and o, the distance overthe top of the tent, in the second formula above. The actual capacity of tents of various dimensions was determinedby using the diagram, Fig. 2, the curves giving the volume in steres—that is, in cubic meters. A stere is approximately 35^ cubic feet. B
. Fumigation dosage. the dimensions usually given by writers on fumigation, butare not the measurements most easily made. The writer suggested, inBulletin No. 122 of this Station, the two measurements that wereemployed in getting the data upon which this study is based. Thesemeasurements are indicated by c, circumference, and o, the distance overthe top of the tent, in the second formula above. The actual capacity of tents of various dimensions was determinedby using the diagram, Fig. 2, the curves giving the volume in steres—that is, in cubic meters. A stere is approximately 35^ cubic feet. Bythe use of this diagram one may readily determine the volume of a tentif he have the dimensions according to either method of measuring, andin either the common or the metric system. The two oblique lines 6 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION. represent the range actually found-in the shape of the trees being fumi-gated. The curved lines show the various volumes in the cube of the Distance over top of Tent. Fig. 2. Diagram for calculating volume of fumigation tents. unit of measurement. Thus, a measurement made in yards would givethe volume of a tent in cubic yards. FUMIGATION DOSAGE. 7 The theoretical shape of tent for which all these calculations aremade represents the largest possible volumes for the given variation, therefore, due to the irregularity of the tree decreasesthe actual volume of the tent. This is on the safe side, since the all-important thing in fumigation is to have the dose strong enough toinsure the death of the insects. LOCAL VARIATION. The difference in the practice of different fumigators is very evidentupon the most cursory examination of the data obtained, but the com-parison of the data in a way that will eliminate other causes of variationthan the one under immediate consideration is far from easy. In orderto ascertain if there is any variation distinctly associated with localities,comparisons were made between the recorded
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