APPROXIMATING DIMENSIONS LND CUBIC CONTENTS. 39 
In undertaking the Fumigation of a large grove the citrus growers 
should avoid underestimating t ho hindrance to the work through winds 
and rains. Fortunately during the season for Fumigating in Florida 
there is comparatively lit i le rainfall in ordinary years. In the central 
Section of Florida winds at night w ill ordinarily interfere very lit t le, hut 
in sections Dear the coast interference from this source may be more 
frequent. From the middle of December until the middle 4 of Febru- 
ary it is well to make allowance for an average of two nights each week 
when Fumigation work will have to he suspended. 
In fumigating seedling trees 30 feel or more in height one could 
expect to fumigate from 300 to 400 trees a week with an outfit of s or K) 
tents. En fumigating trees from 15to20fee1 high with an outfit of 20 
tents one could expect to fumigate from 800 to 1 ,000 trees a week. In 
the cases of both the large and the small trees these estimates can fre- 
quently be exceeded when conditions are favorable, but as the period 
for fumigating is so limited it is advisable to avoid underestimating 
the time required to complete the fumigation of a grove. In plan- 
ningfor the necessary equipment it is safe to calculate that with one 
tent for each 100 trees the work of fumigation can be completed in 
between ten and fourteen nights' work. In many cases it is neces- 
sary to have two complete outfits at work in the same grove when 
the work is started late in the season and there is danger of new 
growth appearing on the trees before one outfit could finish the 
METHODS OF COMPUTING APPROXIMATE DIMENSIONS AND 
CUBIC CONTENTS. 
The dosage recommended in the table given in the appendix is based 
upon detailed records of 100 trees fumigated by the writer and his 
assistants during January and February, 1907. Heretofore tables of 
this kind have been based on the height and diameter of the trees, 
with the exception of one prepared by Prof. C. W. Woodworth, who 
firsl recommended a dosage system based on the dimensions of the 
tented tree-. The two dimensions of practical importance are the 
circumference and the distance over the top from ground to ground. 
The method for obtaining these dimensions has been described. In 
Professor Woodworth's table of dosage referred to above, the amount 
of cyanid was directly proportional to the cubic contents. The table 
of dosage here recommended is based upon actual experience and is, 
as far as known to the writer, the first to take into consideration the 
effect of leakage. Tented trees are always more or less irregular and 
any attempt to calculate the volume of the space inclosed can give 
only approximate figure-. A cylinder surmounted by a hemisphere 
is the regular figure that is nearest to the form of a tented tree. The 
leakage surf ace of a flal octagonal tent covering a tree obviously is not 
