Mr. Dawson’s books certainly showed when he had resumed his attendance on Miss Halcombe at Blackwater Park, but it was not possible to calculate back from this date with any exactness, without such help from Mrs. Michelson as I knew she was unable to afford. She could not say from memory (who, in similar cases, ever can?) how many days had elapsed between the renewal of the doctor’s attendance on his patient and the previous departure of Lady Glyde. She was almost certain of having mentioned the circumstance of the departure to Miss Halcombe, on the day after it happened⁠—but then she was no more able to fix the date of the day on which this disclosure took place, than to fix the date of the day before, when Lady Glyde had left for London. Neither could she calculate, with any nearer approach to exactness, the time that had passed from the departure of her mistress, to the period when the undated letter from Madame Fosco arrived. Lastly, as if to complete the series of difficulties, the doctor himself, having been ill at the time, had omitted to make his usual entry of the day of the week and month when the gardener from Blackwater Park had called on him to deliver