Caterpillars; Snails and Slugs. 
241 
curling of the leaves prevents the grubs from being easily 
reached. These “ leaf-roller ” moths are all very similar in 
their life-history, and the particular species has no great 
interest for the fruit-grower, but it may be mentioned that in 
the cases referred to three species were especially prevalent, 
Lozotcenia rosana on various garden and fruit trees, Tortrix 
ribeana and Antithesia pr^uniana especially on apples and 
plums. 
The safest and most convenient spray is, perhaps, the 
following : — Dissolve six ounces of arsenate of soda in a little 
water, and pour this into 100 gallons of soft water. Also 
dissolve eighteen ounces of acetate of lead (“ sugar of lead ”) 
in a little water, and pour the solution into the 100 gallons 
containing the arsenate of soda. Stir frequently, and deliver 
as a fine spray. Soft soap may be added with benefit. There 
may be no need for spraying at all, but it is very desirable to 
have the ingredients ready in case of emergency, so that the 
wash can be immediately made and applied. 
Snails and Slugs. 
Of these troublesome and familiar garden pests there is 
nothing new to say except that probably much more might be 
done than is done at present in the way of collecting them 
with a lantern at night. Very large numbers might be 
destroyed at slight expense if paid for by the pint, as boys 
would enjoy the fun. Acetylene bicycle lamps are excellent 
for the purpose. Certainly in a garden they soon become 
conspicuously reduced by a few determined raids upon them 
in this way. I have found attempts to trap them somewhat 
disappointing, especially if there are hedges at hand in which 
they can hide, but a good many can be caught by a bait of 
“ brewers’ grains.” 
Of the materials used to keep them off plants, wood ashes 
are the most effective. Soot and lime are of some slight use, 
but by no means furnish impassable barriers. 
A good many of the curious Testacella slugs were found 
during the past year, especially on asparagus beds. They 
should not be destroyed, as they are carnivorous, feeding 
chiefly upon earthworms. It may be recognised by the little 
ear-shaped flat shell at its hind end. It is capable of great 
elongation, and its habit is to pursue earthworms down their 
burrows as the weasel pursues the rabbit. The object of the 
shell is believed to be to protect the slug so engaged from an 
attack in the rear by another testacella which may be seeking 
an earthworm down the same burrow. 
Cecil Warburton. 
Zoological I.aboratory, 
Cambridge. 
VOL. 68, 
B 
