192 



Journal of Agricultural Research 



Vol. XIX, No. s 



Table II. — Inoculations on young putnmelo leaves from infusions of autoc laved soil in 

 tubes 'made on consecutive days after inoculation with P. citri 



Leaves No. 



Date of inocula- 

 tion from tubes 

 to leaves. 



Infections from 200 

 punctures. 



Date of observa- 

 tion. 



I to 5 



6 to 10 



II to 15 



16 to 20 



21 to 25 



26 to 30 



31 to 35 



36 to 40 



41 to 45 



46 to 50 



51 to 55 



56 to 60 



61 to 65 



66 to 70 



71 to 75 



76 to 80 



81 to 85 



86 to 90 



91 to 95 



96 to 100 



loi to 105 



106 to no 



III to 115 



116 to 120 



121 to 125 



126 to 130 

 131 to 135 

 136 to 140 

 141 to 145 

 146 to 150 

 151 to 155 

 156 to 160 

 161 to 165 

 166 to 170 

 171 to 175 

 176 to 180 

 181 to 185 

 186 to 190 

 191 to 195 

 196 to 200 



Oct. 23, 1918 



do 



do 



do 



do 



Oct. 24,1918 



do 



do 



do 



do 



Oct. 21:, 1918 



do. .. .. 



do 



do 



do 



Oct. 26, 1918 



do 



do 



do 



do 



Oct, 28, 1918 



....do 



do 



....do 



do 



Oct. 30, 191S 

 do 



....do : 



....do 



...do 



Nov. I, 1918 



. . . .do 



....do 



....do 



....do 



Nov. 4, 1918 



....do 



....do 



....do 



....do 



100 per cent positive . 



99/^ per cent positive 



100 per cent positive . 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



....do 



....do 



92^ per cent positive. 



ICO per cent positive . . 



Nov. 2, 1918. 



Do. 



Do. 



Do. 



Do. 

 Nov. 4, 19 18. 



Do. 



Do, 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 

 Nov. 5, 1918. 



Do. 



Do. 



Do. 



Do. 

 Nov. 9, 1918. 



Do. 



Do. 



Do. 



Do.. 

 Nov. 20, 19 18. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



SUMMARY OF EXPERIMENT I 



Inoculations made upon young pummelo leaves from infusions made 

 from autoclaved soil tubes inoculated with P. citri were uniformly loo 

 per cent positive or nearly so for 14 days following the inoculation of the 

 soil tubes with P. citri. Inoculations from infusions from tubes of 

 unsterilized soil in which P. citri was inoculated gave uniformly positive 

 results on young pummelo trees during the first 3 days. Thereafter the 

 percentages of positive results were low upon the fourth, fifth, and 

 seventh days. On the ninth day there were but a few positive results 



