248 REPORT OF THE HORTICULTURAL DEPARTMENT OF THE 
valuable of them are immune. Thus Alexander, Oldenburg, Red 
Astrachan, Tetofsky and Titovaka are classed with the sorts which 
show no injury or very slight injury. 
Immunity to bordeaux injury does not correspond with the im- 
munity to the apple scab fungus; many examples may be noted, 
some of which follow: Early Harvest, Esopus Spitzenburg, Fall 
Pippin, Northern Spy and Red Canada are all very susceptible to 
the scab fungus in the Station orchards, but none of them were 
injured by bordeaux mixture, or if so, but very slightly. So, too, 
we find in the list of sorts slightly injured by bordeaux mixture the 
following very susceptible to scab: Chenango, Fameuse, Louise, 
McIntosh and Primate. Coming to the sorts that are badly injured 
by the spray we find Ben Davis, Gravenstein, Mother, Northwestern 
Greening, Wealthy, Yellow Newtown and Yellow Transparent not 
subject to scab. Of those very badly injured by bordeaux mixture, 
_ Jonathan and Wagener are not subject to attacks of the scab fungus. 
A few sorts are subject to the injury and to the scab in like 
degree as follows: Alexander, Gano, Rome, Roxbury, Swaar and 
Tompkins King are nearly immune to the scab and the injury. So, 
too, Grimes, Hubbardston, Oldenburg, Red Astrachan, Sutton and. 
Tolman Sweet are but slightly injured by bordeaux mixture and — 
are free from scab in most seasons. Red June, Rhode Island Green- 
img and Twenty Ounce are the most conspicuous examples of sorts 
very susceptible to both bordeaux injury and the apple scab. 
The comparative immunity of varieties to both the bordeaux 
injury and to the scab should be considered in selecting varieties 
for planting. From the data it appears for the most part that 
varieties immune to the one are susceptible to the other; though 
it should be said that our data regarding immunity to scab are 
not as reliable nor extensive as those pertaining to bordeaux in- 
jury, and hence the conclusion that varieties do not show like im- 
munity to the two troubles is not as well established as we should 
like it to be. 
THE CHEMICAL : AND: PHYSICAL ;COMPOStT Tala 
BORDEAUX MIXTURE. | 
A clear understanding of the injurious action of bordeaux 
mixture on plants cannot be had without some knowledge of the 
chemical and physical composition of the compound. Fortunately 
