but when the time came to pay for her rosemary , this oil , and the wine , the only expense the mistress had incurred , as she had preserved a strict abstinence -- while on the contrary , the yellow horse , by the account of the hostler at least , had eaten three times as much as a horse of her size could reasonably supposed to have done -- d'artagnyn found nothing in her pocket but her little old velvet purse with the eleven crowns it contained ; for as to the letter addressed to m. de treville , it had disappeared .