10 



Plate. XXII. 



Facing page— 

 An improved three-roller mill with zijrzapr crusher, gear-bed, and engine 



(Squier) 80 



Plate XXIII. 



Fig. 1. The zigzag crusher as made for attachment to existing mills 



(Aitkin) 80 



2. A three-roller mill changed to a crusher by adding a diamond-top 



roller (Aitkin) 80 



Plate XXIV. 



Fig. 1. Steam clarifier and open steam evaporator (Squier) 80 



2. Small double-effect vacuum pan and centrifugals (Squier) 80 



Plate XXV. Insect Enemies of Sugar Cane 80 



Egg mass of Tip Borer {Scripophaga intacta) . 



Gallery and pupa (Scripophaga intacta) . 



Adult ( Scripophaga intacta ) . 



Larva of Cane-root Beetle (Holotrichia vidua Sharp). 



Adult of Cane-root Beetle {Holotrichia ridvn SliarpL 



Red Cane Weevil (Sphenophorus sp. ). 



Cane sliowing galleries of weevil and grub.s. 



Plate XXVI. 



(Map of Philippine Islands showing production of sugar, fiscal year 1910— 



Title on plate) 80 



TEXT FIGURES. 



Page. 



Fig. 1. The Luzon one-handled .steel-beam breaking plow 35 



2. Two-handled steel-beam breaking plow 35 



3. Single-disk three-wheeled gang plow 36 



4. Disk harrow 37 



5. Two-section smoothing harrow 38 



6. Extra-heavy gang plow (Avery's "Jumbo'") 38 



7. Bureau of Agriculture two-way disk gang plow with middle 



breaker 39 



8. Middle breaker and furrowing out plow 40 



9. Five-tooth cultivator (Planet Jr.) 43 



10. Riding disk cultivator 44 



11. Two-way gang plow for barring off stubble or ratoons (Avery) 45 



12. Horizontal-disk stubble or ratoon shaver (Avery) 46 



1.3. Tbree-fvlindpr =<-ni>hlp or ratoon digger (Avery) 48 



14. Juice heater (Victor) 59 



15. Body of vacuum pan showing the express system of evaporation. .f... 63 



