June 17, 1918 Effects of Chcmicals on Virus of Mosaic Disease 623 



Table I.— Effects of various chemicals on the infectivity of the virus of the mosaic 

 disease of tobacco — Continued 



UTHIUM NITRATE 



SODIUM NITRATE 



LEAD NITRATE 



SILVER NITRATE 



MERCURIC CHLORID 



I gm. to 100 c. c. of virus solution. 



I gm. to 300 c. c. of virus solution do. 



I gm. to 500 c. c. of \'irus solution do. 



I gm. to 1,000 c. c. of virus solution do. 



I gm. to 1,500 c. c. of virus solution do. 



Virus without addition do. 



Tap water only (control) do. 



Oct. 8, 1915'' 



1 gm. to 100 c. c. of virus solution. . 



I gm. to 200 c. c. of virus solution. . 

 I gm. to 400 c. c. of virus solution. . , 

 I gm. to 600 c. c. of virus solution. . 

 I gm. to 800 c. c, of virus solution. . 

 I gm. to 1 ,000 c. c. of virus solution . 

 I gm. to 1 ,500 c. c. of virus solution , 



Pure paper-filtered virus 



Tap water only (control) 



Nov. 16, 1916a 



.do. 

 .do. 

 .do. 

 .do. 

 .do. 

 .do. 

 do. 

 .do. 



Nov. 13, 191^ (36 

 days later). 



....do 



....do 



do 



....do 



....do 



do 



Dec. 19, 1916 {:ii 



days later). 

 do 



.do. 

 do. 

 .do. 

 ■ do. 

 .do. 

 .do. 

 .do. 



10 Connecticut 



Broadleaf. 

 ....do 



.do. 

 .do. 

 .do. 

 .do. 

 .do. 

 .do. 

 .do. 



All healthy. 



6 plants mosaic. 



8 plants mosaic. 



9 plants mosaic. 



10 plants mosaic. 

 9 plants mosaic. 

 All healthy. 



4 plants mosaic. 



2 plants mosaic. 



5 plants mosaic. 



6 plants mosaic. 

 9 plants mosaic. 



Do. 



Do. 

 8 plants mosaic. 

 All healthy. 



a Virus filtered clear through filter paper before solutions were made. 

 b Virus not passed through filter paper before solutions were made. 



