204 
ferrocyanide mixture was the only one that gave anything like satisfac¬ 
tory results. It formed a thin film, which covered both sides of the leaves 
fairly well. The tendency of all the preparations, with the exception 
of the foregoing, was to collect in drops, and if these attained sufficient 
size their own weight would cause them to roll from the leaf. The in¬ 
ability to wet the foliage was markedly present in the case of the plats 
treated with Bordeaux mixture. Ammoniacal solution was somewhat 
better in this respect, but not so good as the copper borate and cupric 
ferrocyanide mixtures. Ferric chloride solution did not show on the 
leaves at all, nor was it possible, except in rare instances, to distinguish 
the ferrous sulphate on the foliage. Sulphur and sulphosteatite showed 
plainly at first, but a breath of wind or a little rain or dew was suf¬ 
ficient to remove all traces. 
Second treatment (November 25 , 1891).—No marked change had taken 
place in the growth of the plants since the last treatment. Some were 
beginning to stool and others were just pushing through the soil, show¬ 
ing that the seed was somewhat irregular in germinating. Not a pus¬ 
tule of rust could be found in the experimental block or in any of 
the fields near by. As regards the wetting properties of the various 
preparations, little change from what was noted under the first treat¬ 
ment was apparent. All of the liquids were slightly better in this re¬ 
spect, but this was no doubt due to the accumulation from the last 
spraying. Not a vestige of the first application of sulphur and sulpho¬ 
steatite could be seen. 
Third treatment (December 5 , 1891 ).—At this time all the plats were 
examined, and in addition to collecting specimens from each, careful 
notes were made on the injuries, if any, resulting from the various treat¬ 
ments, the adhesiveness of the preparations, and the power each had 
of wetting the foliage. It was found that in plats 24 and 38, as well 
as their duplicates, not a grain had started. The first of these received 
a soil treatment of 13J ounces of potassium bichromate solution to the 
plat j the second was a seed treatment, and consisted of immersing the 
grain twenty-four hours in a 1: 1000 solution of corrosive sublimate. 
Plats 26, 28, 32, 70, 72, and 82 were in very bad condition, not more 
than 1 per cent of the grain in any case having started. The methods 
of treating these plats has been given in Table 1. By referring to this 
it will be seen that in every case where hot water was used the grain 
either failed entirely to start or else made a very feeble growth. A 
good opportunity of testing the adhesiveness of the various prepara¬ 
tions was offered in consequence of a rainfall of nearly an inch since 
the last spraying. Ferrous ferrocyanide, cupric ferrocyanide, copper 
borate, Bordeaux mixture, ammoniacal solution, and cupric hydroxide 
showed on the foliage in the order named. Ferric chloride and potas¬ 
sium sulphide solution were scarcely visible, and sulphur and sulpho¬ 
steatite had entirely disaj>peared. The power of wetting the foliage 
was constant for each preparation throughout the entire experiment 
