
New York AGRIcuLTuRAL Exprrtmment STAtIon. 583 
that it should have been continued to a later day in the ti 
of the whole field, with both early and late celery.” 
As before stated there is no doubt that this disease infests the 
plants in the seed bed, and the importance of early treatments 
can not be too strongly urged. It is not wise to defer treatment 
till the disease attracts attention, because at that time it is almost 
certain to be scattering infection to neighboring plants. If the 
mixture is properly prepared the young plants will not be injured 
by its application. If treatment is begun early, and the mixture 
applied often enough to keep the foliage covered there is reason 
to expect that the disease can be controlled. It would be very 
desirable to get seed guaranteed to be from perfectly ae ) 
plants, but it is doubtful whether such seed can be secured a 
present. 
MAY CELERY BE SAFELY SPRAYED WITH COPPER 
COMPOUNDS ? 
In the past there has generally been much hesitation atout 
recommending the use of copper mixtures for spraying celery 
lest the copper might adhere to the celery and thereby render it 
unfit for food. This subject has been investigated by this Station 
during the past season (1892) and one of the most important 
results of the season’s work on celery diseases and their treatment 
is the establishment of the fact that copper mixtures prepared and 
applied as above recommended may be used im treating 
celery diseases with no fear of poisonous results. Samples of 
sprayed celery, stripped and prepared as for market, were sub- 
niutted to the Chemist for analysis. The results of the analyses 
appear in the following table. Column I gives the material used 
in spraying; column IT gives the average weight of dry substance 
per head; column III gives the number of treatments; column IV 
gives the per cent. of metallic copper found in the dry substance. 
When copper sulphate is prescribed by physicians as a tonic or 
astringent, the dose is from one-fourth grain to two grains. If the 
copper were in the celery in the form of sulphate, column V shows 
how many heads of celery, like the samples analyzed, it would 
be necessary to eat in order to geb a tonic dose; column VI shows 
the number of heads it would be necessary to eat! to get a serious, 
but not necessarily fatal, dose. 
oe ft aad 
