The agreement, with Cassell’s for Tresure Island outright was signed on 2 June 1883. It provided for the payment of £50 on signature and a further £50 when the book was passed for press. RLS was to receive a royalty of £20 per thousand copies sold after the first four thousand. Royalties continued to be paid until the book went out of copyright in 1944.
[For correct and critical edition of this letter, see Mehew 4, 1098.]
To his parents [Colvin 1911, 2, pp. 132-133]
Chalet la Solitude, May 5 
My dearest people,
I have had a great piece of news. There has been offered for Treasure Island – how much do you suppose? I believe it would be an excellent jest to keep the answer till my next letter. For two cents I would do so. Shall I? Anyway, I’ll turn the page first. No – well – A hundred pounds, all alive, O! A hundred jingling, tingling, golden, minted quid. Is not this wonderful?
Add that I have now finished, in draft, the fifteenth chapter of my novel, and have only five before me, and you will see what cause of gratitude I have.
The weather, to look at the per contra sheet, continues vomitable; and Fanny is quite out of sorts. But, really, with such cause of gladness, I have not the heart to be dispirited by anything.
My child’s verse book is finished, dedication and all, and out of my hands – you may tell Cummy;Silverado is done, too, and cast upon the waters;
and this novel so near completion, it does look as if I should support myself without trouble in the future. If I have only health, I can, I thank God. It is dreadful to be a great, big man, and not be able to buy bread.
O that this may last!
I have to-day paid my rent for half the year, till the middle of September, and got my lease: why they have been so long, I know not.
I wish you all sorts of good things.
When is our marriage day? Your loving and ecstatic son,
It has been for me a Treasure Island verily.