ILLUSTRATIONS 
Fio. I. Map Bhowing principal localities in southern California where citrus 
Eruita are produced id 
l'. Leaves and branch of orange infested with purple scale l Lepidoaaphea 
It ckii » II 
:;. Fruit of orange infested with purple scale L2 
i. Branches of orange infested with black scale (Sawetia 6U x) L2 
5. Leaves and branch of orange infested with red Bcale (ChryaompJialua 
aurontii) 13 
6. ( tarange tree almost destroyed by red scale 11 
7. Orange tree showing branches at center partly destroyed and Btripped 
of leaves by purple scale L5 
B. Tray commonly used for carrying the chemicals of Eumigation from 
tree to tree L8 
!). Man carrying tray and water bucket I!) 
LO. A typical California lemon orchard with row of fumigation generators 
placed ready for use the following night 20 
11. Outline of a fumigation lent marked according to the Morrill system. . 28 
12. A fumigation tent marked after the Morrill system 29 
13. Chart showing total amount of gas evolved when different propor- 
tions of water are used 38 
14. ( Grange blossoms at an early stage of development 50 
15. Lead-lined tank used in San Bernardino County for removing sul- 
phuric acid from drums and for filling jugs 53 
16. An improved pipe for removing acid from drums 54 
17. Siphoning acid from a drum by means of a rubber hose 54 
18. Carboy resting against a heap of dirt to facilitate pouring the acid 55 
19. Carboy with handles attached to facilitate pouring the acid and carry- 
ing the carboy 56 
20. Zinc-covered top for protecting cyanid in the field 57 
21. A cover device attached to a fumigation generator 58 
22. Oifference in the direction taken by gas escaping from an open gen- 
erator and from one covered with the corrugated lid 59 
23. Cart used with the improved system of fumigation 60 
24. Karthenware acid jar with attachments for field use 61 
25. A table which can be used instead of a cart in fumigation over very 
r< »ugh ground 62 
A row of tented tree3, and cart at one end ready for dosing 62 
27. Dosing a tree 63 
28. Dosage schedule No. 1 65 
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