. Fumigation dosage. ver, considerable skill and activity. By either method there remains,after the measurements are taken, the necessity of calculation. To dothis by mathematics is of course out of the question. The actual FUMIGATION DOSAGE. 15 volume can be determined quickly and accurately by the use of thediagram (Fig. 2) given above, and a series of curves could be madewhich would give the dose at once instead of the volume. It is very desirable, however, to avoid, if possible, the need of the useof tables and measuring apparatus. Very decided progress in thisdirection has been made by Mr
. Fumigation dosage. ver, considerable skill and activity. By either method there remains,after the measurements are taken, the necessity of calculation. To dothis by mathematics is of course out of the question. The actual FUMIGATION DOSAGE. 15 volume can be determined quickly and accurately by the use of thediagram (Fig. 2) given above, and a series of curves could be madewhich would give the dose at once instead of the volume. It is very desirable, however, to avoid, if possible, the need of the useof tables and measuring apparatus. Very decided progress in thisdirection has been made by Mr. W. H. Payne, of Monrovia, who hasinvented a tent marked off with concentric rings giving the distanceover the top of the tent in terms of the dose required. This schemeshould work well if proper arrangements are provided for coordinatingthe second measurement, that around the tent. A scheme devised by the writer several years ago in Florida for usein fumigating against the white fly seems to solve the problem quite. -*SS3CV=>Lr Fig. 6. Fumigation tents marked to indicate dosage. satisfactorily. It consists in making a series of parallel lines near twoopposite edges of the tent, which are so distanced from the center pointthat they shall correspond with the dosage of a tree of the averageshape. Upon these lines will be placed numerals indicating the dose,the circumference in yards (paces), and the difference (that is, theamount the dose must be varied), should the distance around be moreor less than the amount indicated for an average tent. This planwould permit the estimation of the dosage with sufficient rapidity anda fair degree of accuracy. If the tent is not put on the tree so that itscenter is directly over the center of the tree, the same dosage line maynot touch the ground on the two sides, but the average of the two will 16 UNIVERSITY OF CALIFORNIA—EXPERIMENT STATION. give approximately the correct measurement. A lateral displacementwill give no trouble if the ru
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