64 
preceding especially in the fact that 21 pounds of lime and 18 
pounds of sulphur were used to 50 gallons of water. The method 
of preparation was virtually the same. 
Sixty-six trees, in four rows running across the end of the less- 
infested orchard, II., were treated March 22 with one hundred gal- 
lons of the spray. At a general inspection made May 27, this plot 
was reported as in favorable condition, with very few living scales, 
and none of them young. Examined September 10, the average in- 
festation was figured at 1.36 degrees, which, compared with the infes- 
tation of the two central rows of the check plot, gives a benefit of 
76 per cent, as a consequence of the treatment. Compared with its 
own average infestation of the preceding January, we find this plot 
improved about 44 per cent. ; that is to say, the degree of September 
infestation is approximately 56 per cent, that of the preceding Janu- 
ary. In the check plot, with which this is to be compared, the Sep- 
tember infestation was nearly two and a half times that of January. 
3. This is a simple lime and sulphur mixture like No. i of this 
series, the ingredients being in the same proportions of 15 pounds 
each of lime and sulphur to 50 gallons of water, and differing merelv 
in the method of preparation. In this, the lime was first slaked in 
10 gallons of water where 50 gallons of the spray were to be pre- 
pared, the sulphur was then stirred in dry, and the whole was cooked 
from 30 to 40 minutes. 
One hundred and one trees of Orchard II. were sprayed March 
22 with one hundred and forty gallons of the solution. As this plot of 
six rows, running the whole width of the orchard, lay immediately 
beside the check, the average September infestation of the two 
rows adjoining the check was notably greater than that of the re- 
maining four rows. For the first two rows it averaged 1.9 degrees, 
and for the remaining four rows, 1.44 — an excess of 32 per cent, of 
infestation, apparently due to the proximity of the check and the 
consequent spread of the young from those heavily infested trees. 
On this account the two inner rows of 17 trees each were rejected, 
and the four rows remaining were compared with the two central 
rows of the check plot itself. 
Comparing the 1.44 degrees of infestation of the experimental 
trees with the 5.6 of the rows used as checks, we have a benefit of 74 
per cent, resulting from the treatment. Or, if we choose to compare 
the September condition of the plot with that of January — again 
omitting the rows nearest the check — we find a difference of 38 per 
cent, in favor of the September condition. 
4. This was the so-called "California wash," containing 15 
pounds each of lime, sulphur, and salt, to 50 gallons of water. 
