ILLISTRATIOXS 



I'l.ATKS. 



Page. 

 Plate I. Third crop of healthy callas <,'ri)\vn in tlio panio soil acrordinjr to 



methods adv(»catt'd in this huiletin Frontispiece. 



II. Fig. 1.— The calla-rot organism Xl,(lOO. Figs. 2, 8, 4, an.l -S.— .\gar 



plate colonies 48 



III. Figs. 1 and 2. — .\gar i)late colonies of the calla organism. Fig. .">. — 



Colonies of the calla organism in test tubes 4.S 



IV. Fig. 1. — Stab cultures of the calla f)rganism in gelatin. Fig. 2. — Kaw 



eggplant inoculated with the calla organism. (Natural size.) 48 



V. l-'ig. 1. — Raw radishes three days after inoculatii;g jjieces 2 and 3. 



Fig. 2. — Side view of pieces 1 and 2nine<laysafter inoculating No. 2. 48 



VI. Effect of calla organism on cucuniVjer: .\, inoculated; B, control 48 



VII. Fig. 1. — Raw parsnip three days after inoculating pieces 1 and 3. 



Fig. 2. — Raw carrot three days after inoculating pieces 2 and '.)... 48 

 YIIl. Fig. 1. — Raw tufnip three days after inoculating pieces 1 and 'A. Fig. 

 2. — (ireen fruit and branch of tomato: Xo. 2, inoculated; No. 1, 



control. ( One-fourth natural size. ) 48 



IX. Small calla plant, about two-thirds natural size 48 



TKXT FIGURES. 



Fig. 1. A slightly diseased calla plant 13 



2. A partly decayed calla corm 14 



3. Calla leaf twenty-two hours after inoculating with the calla organism . 15 



4. Calla flower stalk twenty-two liours after inoculating with the calla 



organism 15 



5. Bdcilliis aroi(1f':c with flagella X about 600 ' 16 



6. Fermentation tube ten days after inoculating with the calla organism. 31 



7. Hothouse.hyacinth inoculated in a flower with the calla organism 89 



9 



