Oct. 7-Dec. 30, 1 918 Illustrations VII 



Sweet-Potato Storage-Rots 



Page 

 Plate 21. A. — Sweet-potato softrot, caused by Rhizopus nigricans. B. — 



Sweet-potato ringrot, caused by Rhizopus nigricans 368 



Plate 22. A. — Blackrot of sweet-potato slips caused by Sphaeronema fim- 



briatum. B. — Blackrot on a bedded sweet potato 368 



Plate 23. A. — A sweet potato with four blackrot spots caused by Sphaeronema 

 fimbriatum taken from a storage house in November. B. — The same sweet 

 potato shown in A after being kept in an ice box for two months 368 



Plate 24. A. — An originally healthy sweet potato sprayed with the spores of 

 Sphaeronema fimbriaium and confined in a moist chamber. B. — A typical 

 blackrot spot on a sweet potato as usually foxmd at digging time or in storage. 

 C. — Cross sections of blackrot sweet potatoes, showing the depth to which 

 the fimgus will sometimes penetrate 368 



Plate 25. A. — A sweet potato decayed by the Java blackrot fimgus, Diplodia 

 tubericola. B. — A sweet potato decayed by the dryrot fungus, Diaporthe 

 batatatis 368 



Plate 26. A. — A section through a sweet potato partially decayed by the foot- 

 rot fimgus, Plenodomus destruens. B. — Sweet-potato scmf , caused by Mon- 

 ilochaetes infuscans. C. — A sweet potato entirely covered with scurf 368 



Plate 27. A. — A cross section of a sweet potato decayed by Mucor racemosus 

 at a temperature of 5° C. B. — A longitudinal section of a sweet potato 

 decayed by Alternaria sp. C. — A portion of a sweet potato probably de- 

 cayed by Penici Ilium sp. D. — A cross section of a sweet potato showing 

 the characteristic appearance of the rot caused by Botrytis cinerea. E. — A 

 cross section of a sweet potato almost completely decayed by Epicoccum sp. 

 F. — A longitudinal section of a partly decayed sweet potato 368 



Further Studies on Brisket Disease 



Plate 28. A. — Livers of normal calf and one affected with brisket disease. 

 B. — Hearts of normal animal and one that died of brisket disease. C. — 

 Case 33 , a heifer showing the characteristic symptoms of the brisket disease . . 414 



Plate 29. A. — Interlobular connective tissue in the liver of an animal dead of 

 brisket disease. B. — Fatty accumulation in the liver in early stage of 

 brisket disease 414 



Plate 30. A. — Edema around one of the arterioles in the kidney. B. — Mal- 



pighian body in the kidney of an animal dead of brisket disease 4x4 



Observations on an Outbreak of Favus 



Plate 31. Bird affected with favus: A pronounced case showing involvement 



of the comb, face, and neck 418 



A Contribution to the Biology of Fruit-Fly Parasites in Hawaii 



Plate 32. Oviposition of fruit-fly parasites: A. — Diachasma tryoni ovipositing 

 into fruit-fly larva in fruit of Mimusops elengi. B, C, D. — Teirastichus 

 giffardianus ovipositing into fruit-fly larva. E. — Galesus silvestrii oviposit- 

 ing into fruit-fly puparium 466 



Experiments on the Value of Greensand as a Source of Potassium for 



Plant Culture 



Plate 33. Sand cultures with potassium salts: A. — I, Turkey Red wheat. 

 Potassium supplied in potassium nitrate. II, Red clover. Potassium 

 supplied in potassium nitrate. B. — I, Turkey Red wheat. Potassium 

 supplied in potassium chlorid. II, Red clover. Potassium supplied in 

 potassium chlorid. C. — I, Turkey Red wheat. Potassium supplied in 

 potassium sulphate. II, Red clover. Potassium supplied in potassium 

 sulphate 493 



