ILLUSTRATIONS 



PLATEvS 



Natural Carbonates of Calcium and Magnesium in Relation to the 



Chemical Composition, Bacterial Contents, and Crop-Producing Power 



OF Two Very Acid Soils 



Page 



Plate i. Pot cultures on acid yellow clay soil: A.— Wheat; B.— Red clover; 



C— Red turnip beets 126 



Plate 2. Pot cultmes on acid black sand soil: A.— Wheat; B.— Red clover; 



C— Red turnip beets 126 



Recent Studies on Sclerotium rolfsii Sacc. 



Plate 3. Sclerotium rolfsii: A.— Two colonies in same plate, both apparently 

 of the same sexual strain. B.— Large sclerotia from inoculated orange. 

 C— Late stage, showing cantaloupe reduced to a mass of mycelium and 

 sclerotia. D.— Inoculated cantaloupe fruit, the point of infection being 

 free and away from the bell jar glass. Earlier stage than C. E.— Infected 

 cantaloupe, lying close to bell jar at point of infection. F.— Cross section of 

 an infected cantaloupe , showing penetration of fimgus into interior of fruit . 138 



E>LATE 4. Sclerotium rolfsii: A.— Cabbage artificially inoculated. B.— Cul- 

 tures on artificial media. C— Mustard-seed-like sclerotia on cantaloupe. 

 D — Formation of sclerotia at point of imion of apparently plus and minus 

 strains ^38 



Plate 5 . Sclerotium ro Ifsii: A.— Sweet potato in seed bed , showing method of 

 natural infection of young sprouts. B.— Infected Irish potato, "melter" 

 stage. C. — Longitudinal section of infected sweet potato, showing nature 

 of rot ■ • • 138 



Plate 6. Sclerotium rolfni: A.— Dead tomato plants, showing fungus growing 

 out on the surface of the soil in radial fans. B.— Growth on glass of bell 

 jar, showing radial fans ^i° 



Note on the European Corn Borer (Pyrausta nubilalis Hubner) 

 and Its Nearest American Allies, with Description op Larv^, 

 Pup^, AND One New Species 



Plate 7. European com borer and its nearest American allies: A. — Male 

 genitalia of Pyrausta nubilalis; ventral view of organs spread; aedoeagus 

 omitted. B. — Male genitalia of P. nubilalis; aedoeagus and penis. C. — 

 Male genitalia of P. ainsliei; ventral view of organs spread; aedoeagus 

 omitted. D.— Male genitalia of P. penitalis; ventral view of organs spread; 

 aedoeagus omitted. E. — Forewing venation of P. nubilalis; male. F. — 

 Hindwing venation of P. nubialis; male i^7° 



Plate 8. Female genitalia of Pyrausta spp. : A.— Female genitalia of P. nu- 

 bilalis; lateral view of organs. B.— Female genitalia of P. nubilalis; ven- 

 tral view of plates posterior to genital opening. C— Female genitalia of 

 P. penitalis; ventral view of plates posterior to genital opening. D.— Fe- 

 male genitalia of P. penitalis; lateral view of organs. E.— Female genitalia 

 of P. ainsliei; lateral view of organs. F.— Female genitalia of P. ainsliei; 

 ventral view of plates surrounding genital opening 178 



(VII) 



