.*A 



296 



Journal of Agricultural Research 



Vol. in. No. 4 



Table I. — Effect of dilution upon the infeciivity of the virus of the mosaic disease of 



tobacco — Continued 



Date of in- 

 oculation. 



Number 

 of plants. 



Variety. 



Degree of dilution. 



1913. 



May 29. , 



Do... 



Do... 



J une 1 2 . 



Do... 



Do... 



Do... 



Do... 



June 21. 



Do... 



June 24., 

 Do... 



Do. 

 Do. 



Do. 

 Do. 



I9M. 



April 2 . . 



Do... 



Do. 



Do. 



Do. 



Do. 

 Do. 



Do.. 



April 3. 



Do.. 



Do. 

 Do. 

 Do. 



Do.. 



Do,. 



April 9 



Do.. 



Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 



Connecticut Broadleaf . 

 ....do 



.do. 

 .do. 

 .do. 



...do, 

 ....do. 



20 Cuban 



10 Connecticut Broadleaf, 



15 Cuban 



15 Connecticut Broadleaf. . 



18 Cuban 



15 Connecticut Broadleaf. . 



/lo Cuban 



Vio Connecticut Broadleaf . . 



Cuban 



do 



>Original undiluted virus. . . 



.do., 



.do., 



.do., 

 .do., 



Cotinecticut Broadleaf., 

 do 



.do., 

 .do., 

 .do.. 



Nicotiana rustics. 

 do 



Connecticut Broadleaf., 

 do 



..do 



Nicotiana rustica.. 

 ..do 



.do.. 



.do., 

 .do.. 



Connecticut Broadleaf.. 

 ....do 



Original undiluted virus . . 

 I part virus to 1,000 of 



water. 

 I part virus to 1,000,000 of 



water. 



Tap water alone 



Original undiluted virus . . 

 I part virus to 1,000 of 



water. 

 I part virus to 10,000 of 



water. 

 I part vims to 1.000,000 of 



water. 

 Tap water only 



part virus to 1.000 of 

 water. 



1 part virus to 10,000 of 

 water. 



J- Tap water only 



Ori^nnal undiluted virus. . . 

 I part virus to 1.000 of 



water. 

 I part virus to 10,000 of 



water. 

 I part virus to 100,000 of 



water. 



Tap water only 



Not inoculated 



.do., 

 .do., 

 -do.. 

 .do.\ 

 .do.. 

 ..do. 

 .do.. 



Original undiluted virus. . . 

 I part \'irus to 1.000 of 



water. 

 I part virus lo 10.000 of 



water 

 I part virus to 100,000 of 



water. 

 I part virus to 1,000.000 of 



water. 

 Original undiluted virus. . . 

 I part virus to i.ooo of 



water. 



Tap water alone 



Original undiluted virus. . , 

 I part virus to 1,000 of 



water. 

 I part virus to 1,000.000 of 



water. 



Tap water alone. , 



Original undiluted virus. . , 

 I part virus to 1,000 of 



water. 



do 



Tap water alone 



Original undiluted virus. . 

 1 part virus to 1,000 of 



water. 

 1 part virus to 5,000 of 



water. 

 I part virus to 10,000 of 



water. 

 I part virus to 20.000 of 



water. 

 I part virus to 50.000 of 



water. 

 I part virus to 100,000 of 



water. 

 I part virus to 200.000 of 



water. 

 I part virus to 500,000 of 



water. 



II mosaic on June 5. 

 17 mosaic on June 5. 



All healthy on June 5. 



Do. 



11 mosaic on June 18. 

 8 mosaic on June 18. 



7 mosaic on June 18. 



1 mosaic on June 18. 



All healthy on June iS. 

 26 mosaic on July 6 (18 



Cuban, S Connecticut 



Broadleaf). 

 20 mosaic on July 6 (11 



Cuban, 9 Connecticut 

 [ Broadleaf). 



12 mosaic on July 6 (4 

 Cuban. 8 Connecticut 

 Broadleaf). 



All healthy on July 6. 



T2 mosaic on July 6. 

 19 mosaic on July 6. 



10 mosaic on July 6. 



2 mosaic on July 6. 



All healthy on July 6. 

 Do. 



6 mosaic on April 17. 



2 mosaic on April 17. 



1 mosaic on April 17. 



Do. 

 All healthy on April 17. 



4 mosaic on April 17. 



Do. 



All healthy. 



3 mosaic (m April 17. 



5 mosaic on April 17. 



All healthy on April 17. 



Do. 



8 mosaic on April 17. 



7 mosaic on April 17. 



2 mosaic on April 17. 

 All healthy on April 17. 



9 mosaic on April 25. 

 7 mosaic on April 25. 



2 mosaic on April 25. 



Do. 

 All healthy on April 25. 

 I mosaic on April 25. 

 All healthy on April 25. 



Do. 



Do. 



