ILLUSTRATIONS. 
Page. 
Plate I. Figs. 1-3. — Method of covering small tree with bell or hoop tent 14 
II. Figs. 1-3. — Method of covering small tree with sheet tent by means of 
poles 20 
III. Figs. 1-5. — Successive stages in the operation of shifting a sheet tent 
from one tree to the next in the row. Fig. 6. — First tent ready for 
introduction of chemicals; "tent men" shifting the second tent 
in the series 20 
IV. Fig. 1. — Commissary tray: Open compartment (tin lined) for cyanid 
at right, balances and torch in the middle, compartment for acid 
pitchers and glass graduate at left. Fig. 2. — Top of derrick, show- 
ing method of attaching pulley and guy rope. Fig. 3. — Base of 
derrick, showing method of constructing braces 22 
V. Fig. 1. — Raising 33-foot derricks to an upright position. Fig. 2. — Der- 
ricks in position (one on each side of tree), supported by guy ropes; 
pulleys hooked to catch-rings in the tent 28 
VI. Fig. 1. — Front edge of sheet tent raised to tops of derricks, ready to be 
pulled over tree. Fig. 2. — Sheet tent ready for introduction of 
chemicals 28 
VII. Fig. 1. — Eighty-foot tent covering large seedling orange tree, showing 
tent graduated for the purpose of enabling operators to use dosage 
table given in the appendix. Fig. 2. — Carrying 5-gallon crocks con- 
taining acid and water under the tent, preparatory to introducing 
the cyanid 32 
TEXT FIGURES. 
Fig. 1. Plan for construction of octagonal sheet tent 50 feet across, showing lines 
used in constructing octagon 16 
2. Method of attaching hooks to tent when covering trees with aid of der- 
ricks 18 
3. Plan for schedule board, showing convenient arrangement 22 
4. Diagram of regularly set grove in process of fumigation with an outfit of 
four tents 23 
5. Diagram of grove with alternating trees; first four rows in process of 
fumigation with four tents; three sets of trees fumigated, the tents 
being moved from south to north 24 
6. Diagram showing method of marking tents to aid in obtaining dimen- 
sions of inclosed space when covering tree 32 
7. Tent marked to aid in estimating dosage, in position for fumigation. ... 33 
8. White fly (Aleyrodcs titri) : Stages and details 59 
9. White fly (Aleyrodes titri): Adult male and female and details 59 
10. Florida red scale ( Chrysomphahis ficus) : Stages 61 
11. Purple scale (Lepidosaphes bechii) : Stages 62 
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