36 
inches of the bark and the spraying being very thoroughly done. Ata 
distance of 18 inches, as tested by spraying on one’s hand, the mist or 
spray was barely warm; at a distance of 12 inches, fairly hot, and very 
hot at from 4 to 6 inches. The bark of the trees sprayed was cold to 
the hand as soon as spraying stopped. This hot-water spray brought 
to bear closely on the scale insects, it was thought, would kill them, 
although it would of course be impracticable to make such close- 
range application in general practice. On the contrary, however, 
the scales remained in a vigorous, healthy condition, and apparently 
did not suffer in the least from the warm douche. 
The results, therefore, gained by the lime, sulphur, and salt wash 
may be properly ascribed, it is believed, to a true insecticidal value of 
the substance rather than to the temperature of the application. The 
trees treated with this wash remained nearly snow-white, little, if any, 
of the mixture being taken off by the light snow and rain of the 25th 
and 26th instant. Discoloration of the Diaspis began to be noticed on 
the 27th instant. On April 13 the Diaspis scale insects killed ranged 
between 20 and 50 per cent on the young, vigorous limbs. All were 
dead on the old trunk, where the wood was in a very unhealthy condi- 
tion owing to the completeness of the infestation, both by the Diaspis 
and the Aspidiotus. The San Jose scale, so far as investigation could 
determine, seemed to be killed completely; no insects were found 
on the young, vigorous shoots or older wood. ‘The trees were still 
whitened with the wash, which had not been carried off to any very 
great extent by the heavy rains of April 11 and 12. The infested 
trees, especially those that had been pruned back, made a very vigorous 
growth, and the fruiting and growth of the others were entirely 
satisfactory. 
In this experiment, which differed so remarkably in results from 
other experiments made in the East with this substance, it must be 
noticed that the weather conditions were exceptionally favorable. 
The application was made on March 23, and no washing rains followed 
until April 11 or 12, the light rain and snow of the 25th and 26th of 
March being not enough to vitiate the wash particularly, as very 
little of the snow rested on the trees, and much that did gain lodgment 
fell or was blown off subsequently. A very light shower occurred on 
April 4, but the first heavy downpour and long rain occurred on the 
night of April 11. 
This experiment would seem to indicate that if one could count on a 
week or two of good weather following an application, the lime, 
sulphur, and salt wash might be as beneficial in the East as on the 
Pacific coast. Its cost is inconsiderable compared with the other treat- 
ments for the San Jose scale. 
During the summer of 1900 the writer spent considerable time in 
California and saw a great many deciduous orchards that had been 
