DOSAGE SCHEDULES OF MORE IMPORTANT WRITERS 
L9 
in excess of 20 ounces in a 2-gallon 
quently boil over, especially if the 
generator, the contents \\ ill Fre- 
cyanid is in small lumps or is 
])ow dered. 
DOSAGE SCHEDULES OP THE MORE CMPORT ANT WRITERS ON FUMIGATION. 
Since the publication by Morse, in L887, of the first dosage schedule 
for use in fumigating citrus trees with hydrocyanic-acid gas, a great 
many tables of 
dosage have been 
rec ommen d e d 
through publica- 
tions in this coun- 
try and abroad. 
Among the more 
mi t hori t a t ive 
contributions on 
this subject are 
those of Coquil- 
lett . Morse, Craw, 
Marlatt, Johnson, 
Havens, Wood- 
worth, Pease, and 
Morrill, of this 
country; C. P. 
Lounsbury, of 
Sou tli Africa, and 
W. J. Allen, of 
New South Wales. 
A careful study 
has been made of 
the dosage sched- 
ules proposed by 
these different in- 
vestigators with a result most surprising. In the first place, we 
must consider that uniform dosage will not be given to trees 
unless based directly on their cubic contents when covered with 
a tent. Secondly, dosage t aides prepared for trees merely with 
regard to their cubic contents and without regard to the varying pro- 
portions of leakage surface present in trees of different sizes are 
faulty to a large degree. Of all the dosage tables which have come 
to the writer's attention only those by Lounsbury, in South Africa, 
by Morrill, in Florida, and a recent one by Wood worth in California, 
have been based on the proper assumptions. The other tables were 
either based directly on the cubic contents without regard to leakage 
surface, or were 4 prepared without any knowledge whatever of the 
cubic contents represented by trees of given dimensions. Several 
FIG. '.i.— Man carrying tray and water bucket. (Original.) 
