ILLUSTRATIONS 



PLATES. 



Page. 

 Plate I. Normal and abnormal growths of bamboo 38 



II. Effect of formaldehyde gas on cultures of Thielaviopsis. A, Check; 

 B, C, and A transfers from cultures subjected for 15, 30, and 60 

 minutes, respectively, to gas generated from 800 c. c. of formalin 

 per 1,000 cubic feet of air space 38 



III. Effect of formaldehyde gas on cultures of Thielaviopsis. A, Check; 



B, C, and D, transfers from cultures subjected for 15, 30, and 60 

 minutes, respectively, to gas generated from 900 c. c. of formalin 

 per 1,000 cubic feet of air space 38 



IV. Fumigated and nonfumigated pineapples. A, Check; B, fruit in- 



oculated ana fumigated, and C, fruit inoculated and nonfumi- 

 gated 38 



V. Cultures from inoculated pineapples before and after the fumigation 

 of the fruit. A and B, Transfers before fumigation; C and D, 

 transfers after fumigation. The fruit was subjected to gas gen- 

 erated from 1,250 c. c. of formalin per 1,000 cubic feet of air space. 38 

 VI. Cultures from inoculated pineapples before and after the fumigation 

 of the fruit. A and B, Transfers before fumigation; C and D, 

 transfers after fumigation. The fruit was subjected to gas gen- 

 erated from 1,300 c. c. of formalin per 1,000 cubic feet of air space. 38 

 VII. Fumigated and nonfumigated pineapples. A, Check; B, sprayed 

 with spores and fumigated, and C, sprayed with spores and non- 

 fumigated 38 



VIII. Artificially inoculated pineapples. Fig. 1.— Fruit inoculated by in- 

 cision method. Fig. 2. — Fruit sprayed with spores 38 



TEXT FIGURES. 



Fig. 1. Sketch showing the front elevation of the fumigating box used in the 



experiments and the construction of the door 18 



2. Sketch showing the side view of the fumigating box and the arrange- 



ment of the drawers 19 



3. Sketch showing a sectional view of the interior of the fumigating box 



with the psychrometer attached 20 



171 

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