Journal of Agricultural Research 



An Automatic Transpiration Scale of Large Capacity for Use with 

 Freely Exposed Plants 



Page 



Plate IX. Fig. i. — Four automatic balances in operation at Akron, Colo., 

 June 19, 1912, with the front of the box containing the mechanism open. 

 The recording device is shown just beyond the first box. Fig. 2. — Auto- 

 matic balances, Akron, Colo., July 24, 1912; boxes closed and recorders 

 covered 132 



Plate X. Fig. i. — Front of balance, cover removed, showing mechanism. 



Fig. 2. — General view of automatic balance with case removed 132 



Plate XI. Fig. i, — Measuring tray used in counting total number of balls 

 delivered to the container on the balance arm during the 24-hoiu- period. 

 Fig. 2. — Another view of the measuring tray looking vertically downward 

 on the tray, showing the 60° angle which the base makes with the graduated 

 side 132 



AlTERNARIA PANAX, THE CaUSE OF A RoOT-ROT OF GiNSENG 



Plate XII. Lesions on ginseng roots due to Alternaria panax 



Plate XIII. Fig. i. — Longitudinal section of ginseng root showing the results 

 of inoculation with Alternaria panax. Fig. 2. — Inoculations on ginseng 

 leaves with the species of Alternaria isolated from ginseng roots 182 



Some Potato Tuber-Rots Caused by Species of Fusarium 



Plate A (Colored). Fusarium spp. on vegetable media: Fig. 1-3 and 5. — 

 Fusarium oxysporu?ti Schlecht. 3045. i. Twenty-one-day-old culture on 

 potato cylinder showing typical bluish green sclerotial masses, no pion- 

 notes. 2, Eighteen-day -old culture on stem of Melilotus alba with pion- 

 notes. 3, Eighteen-day -old rice culture with typical coloration of the sec- 

 tion Elegans. 5, Thirty-day -old cotton-stem culture with sporodochia. 

 Fig. 4. — F. hyperoxysporum Wollenw. 3343. Thirty-one-day -old culture 

 on potato cylinder with development of pionnotes. Fig. 6-8. — F. radicicola 

 Wollenw. 6, Potato cylinder 34 days bid with pionnotes bro\\Ti to ver- 

 digris. 7, Seventeen-day -old culture on stem of Melilotus alba with pion- 

 notes and immature sporodochia. 8, Rice 28 days old, with pionnotes on 

 upper surface 210 



Plate B (Colored). Fusarium spp. on vegetable media: Fig. i-^-— Fusarium 

 discolor Appel and Wollenw. 153, showing typical color reactions of this 

 type species of the section Discolor, i , Potato cylinder 1 1 days old, showing 

 carmine-red pigmentation of the plectenchymatic mycelium. 2, Culture 

 on cotton stem 35 days old, showing sporodochia and pionnotes drying out. 

 3, Rice cultiue 11 days old. Fig. 4-6. — F. discolor, var. sulphureum 

 (Schlecht.) Appel and Wollenw., 154. 4, Ocherous-orange pionnotes on 

 ii-day-old potato cylinder. 5, Sporodochia on 39-day -old cotton-stem 

 culture. 6, Rice culture 11 days old 210 



Plate XIV. Fig. i.— Fusarium oxysporum Schlecht. Fig. 2.— -F. radicicola 

 Wollenw. Fig. 2>-—P- solani (Mart.) Sacc. Fig. 4.— F. eumartii, n. sp. 

 Normal conidia. Fig. 5.— F. coerukum (hih.) Sacc. Fig. 6.-— F. discolor, 

 var. sulphureum (Schlecht. ) App. and Wollenw 210 



Plate XV. Fig. i, 2.— Potato tuber showing a soft-rot caused by Fusarium 

 hyperoxysporum Wollenw. Fig. 3.— Potato tuber showing the type of rot 

 produced by F. oxysporum in the experiments. Fig. 4, 5.— Potato tuber 

 showing a dry-rot caused by F. radicicola 210 



Plate XVI. Two "jelly-end" tubers from Moorland, Cal., showing external 



views and longitudinal sections 210 



