620 



Journal of Agricultural Research 



Vol. XIII, No. 13 



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

 disease of tobacco — Continued 



NITRIC ACID — continued 



HYDROCHLORIC ACID 



I gm. to 50 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 800 c. c. of virus solution. . 

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

 I gm. to 2,000 c. c. of virus solution. 

 I gm. to 4,000 c. c. of virus solution. 



Virus without addition 



Tap water only (control) 



Apr. 25, 1914 



.do. 

 .do. 

 .do. 

 .do. 

 .do. 

 .do. 

 .do. 

 .do. 



I gm. to 100 c. c. of virus solution...! Jan. 7,1915 



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. 

 Tap water only (control) 



.do. 

 .do. 

 .do. 

 .do. 

 .do. 



Apr. 27, 1914 (2 



days later). 

 ....do 



.do. 

 .do. 

 .do. 

 .do. 

 .do. 



do. 



do. 



Jan. 8, 191S (i 

 day later). 



do 



do 



do 



do 



do 



10 Connecticut 



Broadleaf. 

 ....do 



All healthy. 



Do. 



.do Do. 



.do Do. 



.do 4 plants mosaic. 



.do 8 plants mosaic. 



.do 9 plants mosaic. 



.do I 10 plants mosaic. 



.do All healthy. 



.do. 



.do. 

 .do. 

 .do. 

 .do. 

 .do. 



Do. 



6 plants mosaic. 

 9 plants mosaic. 



Do. 

 8 plants mosaic. 

 All healthy. 



» virus filtered clear through filter paper before solutions were made. 



