- 13 - 



Plot C: Ail plants except two remained healthy to the 

 last; number 21 became diseased very soon viz. 

 twenty days after setting out and was removed 

 inmediately. At the end plant number 11 

 showed the symptoms of the disease in the top. 

 Plot D: At the second banking ail the uneven num- 

 bers, plants 1, 3, 5— 39 were already dis- 

 eased, while ail even numbers, plants 2, 4, 

 6—40 were still perfectly healthy. 

 About thirty days however after setting ont, 

 the disease appeared on plants numbers 4, 

 32 and 38 ; while finally the symptoms of 

 the disease were discovered on plants num- 

 bers 12, 16, 26 and 30 in the top. To the 

 end numbers 2, 6, 8, 10, 14, 18, 20, 22, 

 24, 28, 34, 36, and 40 remained unattacked. 

 The assistant who conducted tins experiment acknow- 

 ledged afterwards, that he sometimes made à mistake in the 

 beginning, with the even and uneven numbers in Plot D. 

 On May 16" 1 an experiment was started with four 

 hundred healthy young plants, which stood in tenrows 

 of forty plants each. 



Instead of a healthy plant in holo number 1 of the 

 flrst row, a diseased seedling was intentionally planted 

 and beginning with this one, ail the other three hunderd 

 ninety-nine plants were touched each morning. 



After three weeks an examination was made to find 

 how far the spreading of calico had extended itself by 

 this experiment. The resuit was as follows : 



l ste Row 4 . . . = 40 ; 6 tt Row = 25 



2" d „ = 35 ; T h „ = 16 



3 d „ = 30 ; 8 th „ = 20 



4 (A „ = 28 ; 9"' „ = 15 



b th = 20 ; 10"' „ = 11 



