Mr Savory’s book

AnonymeThe London Mercury, Londres, The Field Press, 1929, p. 331.

And I have seen a water spider-one could have wished for more than a casual reference to this fascinating genus in Mr Savory’s book- toy with a living caddis-worm, which he had extracted from its case, much as a cat plays with a mouse. From these observations I have not doubt that the spider can control the quantity of venom ejected from his fang-ducts; which argues a certain measure of intelligence.