'I thought he would stick to the steamer,' said Ross at last.

'And probably,' said Dunbar, 'he is as safe there as anywhere he can be. He can't work his boat without a crew, but if he is armed he will be able to defend himself even if he is attacked. I don't know how many boats there were at La Dorada, but I would lay my life that Purvis took the precaution of sending them adrift or wrecking them before he got away.'

'What is to be the next move?' said Peter.

'I suppose we shall have to ride down to Taco to-night,' said Dunbar. 'Yon man,' he finished, in his nonchalant voice, 'has given me a good bit of trouble in his time.'

'It seems to me,' said Ross, 'that you can't touch any business connected with Purvis without handling a pretty unsavoury thing.'

'Now, I 'll tell you an odd thing,' said Dunbar. 'I have had to make some pretty close inquiries about Purvis since I have been on his track, and you will probably not believe it if I tell you that by birth he is a gentleman.'

'He behaves like one,' said Ross shortly.

'If I had time,' said Dunbar, 'I could tell you the story, but I see the fresh horses coming round, and I and the commissario must get away to Taco.' He was in the saddle as he spoke, and rode off with the commissario.

'A boy,' said Hopwood, entering presently, 'rode over with this, this moment, sir.' He handed a note to Peter on a little tray, and waited in the detached manner of the well-trained servant while Peter opened the letter.

The writing was almost unintelligible, being written in pencil on a scrap of paper, and it had got crushed in the pocket of the man who brought it.