17 
ones the increase was 3.484 percent. As regards length or growth 
of shoots, the increase on the treated vines was 116.70+ per cent. In 
view of the fact that no diseases of consequence appeared from the 
tine of the first till the third treatment, it seems hardly likely that 
the increase in growth was due to the sprayings. We are inclined to 
believe that the difference, as brought out by these figures, was due to 
causes wholly outside of the work in hand. 
Unless in cases where the leaves and shoots are being rapidly de- 
stroyed by some active parasite, the effect of treatment on growth is 
not to be looked for until the following season; providing, of course, 
there is no injury from the applications. 
Fourth treatment.—This was made on June 9, the vines, owing to re- 
cent heavy rains, being in excellent condition. The foliage was nearly 
grown, while the fruit was about the size of bird shot. Below we give 
our field notes as regards the condition of each plat with respect to in- 
jury to the foliage from the treatment and from black rot. The latter 
was confined wholly to the leaves, this being the first time its presence 
was noted, although from the general condition of the vineyard it is 
probable that an examination four or five days earlier would have 
revealed it. It is safe to say, however, that black rot appeared beween 
June 9 and 9. 
Plat 1.—No treatment. No black rot. 
Plat 2.—Ammoniacal solution. Ten of the vines have their leaves slightly injured, 
the edges being reddish in color and more or less curled. No black rot whatever 
was found on any of the vines. 
Plat 3.—No treatment. One vine has its leaves affected with black rot. 
Plat 4.—Five vines slightly injured. No black rot. 
Plat 5.—No treatment. Foliage in good condition; no black rot. 
Plat 6.—Precipitated carbonate of copper solution. Five vines slightly scorched; 
no black rot. 
Plat 7.—No treatment. Foliage in good condition; no black rot. 
Plat 8.—Copper saccharate. Seventeen of the vines are slightly scorched, the 
edges of the leaves being curled; no black rot. 
Plat 9.—No treatment. Foliage in good condition; no black rot. 
Plat 10.—Glue mixture. The leaves of 12 vines are considerably scorched; no 
black rot. 
Plat 11.—No treatment. Foliage in good condition; black rot on one vine. 
Plat 12.—Bordeaux mixture. Foliage perfect in every particular. 
Plat 13.—No treatment. No injury whatever. 
Plat 14.—Copper acetate solution. Two vines have their leaves scorched; no 
black rot. 
Plat 15.—No treatment. Black rot on the leaves of one vine, otherwise all parts 
in good condition. 
Plat 16.—Copper chloride mixture. Foliage not injured by the treatment; black 
rot on four vines. 
Plat 17.—No treatment. Foliage in perfect condition. 
Plat 1S.—Potassium sulphide solution. No injury from the spraying and no black 
rot. 
Plat 19.—Untreated. Three vines affected with black rot. 
Plat 20.—Sodium hyposulphite solution. Foliage slightly injured and three vines 
affected with black rot. 
4816—No. 3 2 

