Slugging it out in the garden

Sir, – James O'Keeffe (May 10th) suggests slugs are deterred by eggshells and coffee grounds. Do slugs instinctively understand coffee is a stimulant, which would result in them being less sluggish? – Yours, etc,

PAUL GALLAGHER,

Roebuck Castle,

Clonskeagh,

Dublin 14.

Sir, – There are more humane ways of getting rid of slugs and snails other than killing them. You can always try to reason with them or send them a solicitor’s letter, but if that does not work you may well have to line your allotment with election posters. – Yours, etc,

EUGENE TANNAM,

Monalea Park,

Firhouse, Dublin 24.