770 Uejfiort on Prevention and, Ciire of Potato Diseased 
should be repeated if the marks of the first dressing have been 
removed by rain. 
4. That, even if delayed until disease comes, a lessening of the 
spread of disease may to some degree be effected by a late dressing, 
and the crop, as a rule, will be sufficiently increased to pay for the 
application. 
These results are borne out by four of the five stations at which 
the experiments were complete, those in Kent, Bedfordshire, Lincoln- 
shire, and Devon exemplifying them almost in every particular, even 
wdth the many plots comprising the experiments at each spot. The 
results in Cheshire are the. only ones that tell adversely to the utility 
of the dressing, and even here, in the case of one of the four crops, 
a large gain in yield was experienced. The general results may 
accordingly be stated as distinctly showing the advantage of using 
the houillie borddaise dressing, whether disease appears or not, and 
that the best plan is to apply the dressing about a fortnight before 
disease is likely to appear, and to renew it when washed off. 
The foregoing Report on this year’s experiments with houillia 
borddaise has been drawn up by Dr. Voelcker. 
The following note is supplied by Mr. Carruthers on the experi- 
ments with potatoes conducted by him at Norwood : — 
The plot of ground on which the experiments wmre carried out had 
been in grass for many years ; after it was trenched and well 
dunged, the potatoes were planted in the end of April. The seed 
tubers belonged to twelve vai’ieties, and were planted in as many 
plots, each 16 feet by 8 feet and containing 32 plants, so that every 
plant had 4 square feet to itself. There were consequently 384 seed 
potatoes planted, but of these seven failed to germinate. 
The appeai’ance of the plants above ground extended from 
May 19 to June 13. The earliest variety was the “ Early Regent,” 
all the plants of it being visible by May 27. This was followed 
closely by the “Magnum Bonum ” and the “Abundance,” and then the 
“Bruce,” the “ Holborn Prolific,”and the “Canon,” all of which finished 
their germination within the fortnight. The “ Beauty of Hebron ” 
and the “ Holborn Reliance ” finished in the third week, while the 
“ White Elephant,” “ Carter’s Surprise,” “ Myatt’s Ashleaf,” and the 
“ Imperator ” extended into the fourth week. 
Six of the potatoes were attacked shortly after germinating by 
a fungus which destroyed the tissues of the stem just above the 
.ground, so that the leaves and the upper part of the stem fell to the 
earth and withered. The brown mycelium penetrated the cellular 
tissues, and spread itself over the sui’facc of the stem at that part ; 
portions of the stem w^ere kept in a moist warm atmosphere, but 
although the mycelium continued to grow and spread over the glass, 
it produced no fructification, so that the species doing this injury 
could not be determined. 
There was a vigorous growth of haulm above ground, but the 
