VI Journal of Agricultural Research voi.xvi 



Page 



Plate 6. Representative plates from i to 40,000 bacterial dilution of acid 

 whitish silt loam kept at different moisture contents: Aj. — Aerobic plates 

 from soil kept one-fourth satiu-ated. H,. — Anaerobic plates from soil 

 kept one-fourth saturated. Cj. — Aerobic plates of carbon-dioxid-surviv- 

 ing organisms from soil kept one-fourth saturated. Aj. — Aerobic plates 

 from soil kept one-half saturated. H2. — Anaerobic plates from soil kept 

 one-half saturated. C2. — Aerobic plates of carbon-dioxid-stu-viving organ- 

 isms from soil kept one-half saturated. A3. — Aerobic plates from soil 

 kept fully saturated. H3. — Anaerobic plates from soil kept fully satu- 

 rated. C3. — Aerobic plates of carbon-dioxid-surviving organisms from 

 soil kept fully saturated 42 



Plate 7. Representative plates from i to 40,000 bacterial dilution of acid 

 brown silt loam kept at different moisture contents: Aj. — Aerobic plates 

 from soil kept one-fovu-th saturated. Hi. — Anaerobic plates from soil 

 kept one-fourth saturated. Cj. — Aerobic plates of carbon-dioxid-siu-viv- 

 ing organisms from soil kept one-fourth saturated. Aj. — Aerobic plates 

 from soil kept one-half saturated. Hj. — Anaerobic plates from soil kept 

 one-half saturated. Cj. — Aerobic plates of carbon-dioxid-surviving 

 organisms from soil kept half saturated. A3. — Aerobic plates from soil 

 kept fully saturated. H3. — Aerobic plates from soil kept fully saturated. 

 C3. — Aerobic plates of carbon-dioxid-surviving organisms from soil kept 

 fully saturated 42 



Plate 8. Representative plates from i to 40,000 bacterial dilution of acid 

 black peat>' sand kept at different moisture contents: Aj. — Aerobic 

 plates from soil kept one-fourth saturated. H,. — Anaerobic plates from 

 soil kept one-fourth saturated. C,. — Aerobic plates of carbon-dioxid- 

 surviving organisms from soil kept one-fourth satm-ated. Aj. — Aerobic 

 plates from soil kept one-half saturated. Hj. — Anaerobic plates from 

 soil kept one-half saturated. C2. — Aerobic plates of carbon-dioxid-sur- 

 viving organisms from soil kept one-half saturated. A3. — Aerobic plates 

 from soil kept fully saturated. H3. — Anaerobic plates from soil kept 

 fully saturated. • C3. — Aerobic plates of carbon-dioxid-surviving organ- 

 isms from soil kept fully saturated 42 



Plate 9. Representative plates from i to 40,000 bacterial dilution of acid 

 dark-brown peat kept at different moistiu-e contents: Aj. — Aerobic 

 plates from soil kept one-fourth satxirated. H,. — Anaerobic plates from 

 soil kept one-fourth saturated. C^ — Aerobic plates of carbon-dioxid- 

 surviving organisms from soil kept one-fourth saturated. Aj. — Aerobic 

 plates from soil kept one-half satmated. H2. — Anaerobic plates from 

 soil kept one-half satiu-ated. C2. — Aerobic plates of carbon-dioxid-sur- 

 viving organisms from soil kept one-half saturated. A3. — Aerobic plates 

 from soil kept fully sattu-ated. H3. — Anaerobic plates from soil kept fully 

 saturated. C3. — Aerobic plates of carbon-dioxid-surviving organisms 

 from soil kept fully saturated 42 



Physoderma Disease of Corn 



Plate A. Com leaf showing the effects of an attack by Physoderma zeae- 



maydis i54 



Plate B. Sheath and culm of com plant showing the effects of Physoderma 



zeae-m^ydis ^ 54 



Plate 10. Blade and sheath of com plant showing the effects of severe 

 attack by Physoderma zeae-maydis. 



