212 
Bordeaux mixture and ammoniacal solution of copper carbonate pre¬ 
vented this fungus to a large extent. 
((>) All plants except those sprayed with Bordeaux mixture, ammo¬ 
niacal solution, and ferrous ferrocyanide, showed from 5 to 20 per cent 
of yellow foliage. The above exceptions were practically free from the 
trouble. 
(7) The injury to the plants resulting from the work was only marked 
in the case of the soil and seed treatments. These are referred to in 
detail in Table 2. 
Observations on June 4 , 1892 .— From May 20 to June 4 rust rapidly 
increased; in fact, at the latter date not a leaf could be found that did 
not show the fungus. The lower leaves were in every case the more 
badly diseased; the rust sori, however, were found in great quantities 
on the very topmost leaves. All the fields in the neighborhood were 
badly rusted, in many cases the plants being literally red with the 
fungus. For the first time the teleutospores were found and upon ex¬ 
amination it was seen that they possessed all the characteristics of those 
belonging to Puccinia ruingo-vera. No further field notes were made 
and on June 9 the crop was harvested. The crop on each plat was cut 
in the usual manner, after which each bundle was marked with a uum- 
bered tag, and shocked after the ordinary fashion. The weight of the 
straw and grain, weight of grain, and weight of straw were next deter¬ 
mined. The straw and grain together were first weighed, then the 
latter was flailed out and weighed, thus giving the rest of the data. A 
careful study of these figures reveals so little of interest that it is deemed 
unnecessary to publish them in full. The yield was fairly even through¬ 
out the field, the only striking differences in this respect being where 
the plants were thin on account of certain seed and soil treatments, the 
injurious effects of which have already been pointed out. Summing up 
this phase of the subject, it may be said that so far as affecting the yield, 
except in the cases noted, the treatments had no appreciable effect. 
SUPPLEMENTARY EXPERIMENTS IN THE TREATMENT OF RUST OF 
WHEAT AND OTHER CEREALS AT GARRETT PARK, MARYLAND. 
As a supplementary experiment it was decided early in March, 1892, 
to spray spring-planted wheat, oats, and rye with a number of the 
standard fungicides, using full and half strength solutions. It was 
thought best to plant the grain as late as possible in order to invite 
the attacks of rust fungi. No harvest of course was expected. On 
May 17 fifty-seven plats, each 3 by 33 feet, were staked off. Thirty-six 
plats were planted with wheat, 12 with oats, and 9 with rye. In 
the case of each crop half of the plats were treated and half were 
left for control. The fungicides used were Bordeaux mixture, full and 
half strength, ammoniacal solution, full and half strength, sulphur and 
sulphosteatite. The Bordeaux mixture, full strength, contained 6 
Pounds of copper sulphate and 4 pounds of lime to 22 gallons of 
water. The ammoniacal solution was made by dissolving 2J ounces 
