‘Humph,’ returned Vandeloup, thoughtfully, lighting a cigarette, ‘I do not agree with you there; it was her so-called astrologer, Ruggieri, who prepared all her potions. Catherine certainly had the power, but Ruggieri possessed the science—a very fair division of labour for getting rid of people, I must say—but what have you got there?’ nodding towards a large book which Gollipeck carried under his arm.

‘For you,’ answered the other, taking the book slowly from under his arm, and thereby causing another button to fly off, ‘quite new,—work on toxicology.’

‘Thank you,’ said Vandeloup, taking the heavy volume and looking at the title; ‘French, I see! I’m sure it will be pleasant reading.’

The title of the book was ‘Les Empoisonneurs d’Aujourd’hui, par MM. Prevol et Lebrun’, and it had only been published the previous year; so as he turned over the leaves carelessly, M. Vandeloup caught sight of a name which he knew. He smiled a little, and closing the book put it under his arm, while he turned smilingly towards his companion, whom he found looking keenly at him.

‘I shall enjoy this book immensely,’ he said, touching the volume. Dr Gollipeck nodded and chuckled in a hoarse rattling kind of way.

‘So I should think,’ he answered, with another sharp look, ‘you are a very clever young man, my friend.’

Vandeloup acknowledged the compliment with a bow, and wondered mentally what this old man meant. Gaston, however, was never without an answer, so he turned to Gollipeck again with a nonchalant smile on his handsome lips.

‘So kind of you to think well of me,’ he said, coolly flicking the ash off the end of his cigarette with his little finger; ‘but why do you pay me such a compliment?’

Gollipeck answered the question by asking another.

‘Why are you so fond of toxicology?’ he said, abruptly, shuffling his feet in the long dry grass in which they were now walking in order to rub the dust off his ungainly, ill-blacked shoes.