Having at length got his would-be son-in-law out of the house, Mr. Blandy determined to be fooled no further; he ordered Mary to write to Cranstoun telling him on no account to show his face again at Henley until his matrimonial difficulties were "quite decided." Tears and entreaties were of no avail; like all weak characters, Mr. Blandy, having for once put down his foot, was obdurate. This ultimatum she duly communicated to her lover in the North; if we could know in what terms and how replied to by him, we should solve the riddle. Hitherto they seem to have trusted to time and the old man's continued credulity to effect their respective ends, but now, if Miss Blandy were to secure a "husband" and Cranstoun lay hands upon her £10,000, some definite step must be taken. Both knew, what was as yet unknown to Mr. Blandy, that the appeal had long since been dismissed, and that while his wife lived Cranstoun could never marry Mary. At any moment her father might learn the truth and alter, by the stroke of a pen, the disposition of his fortune. That they openly agreed to remove by murder the obstacle to their mutual desires is unlikely. Cranstoun, as appears from all the circumstances, was the instigator, as he continued throughout the guiding spirit, of the plot; probably nothing more definite was said between them than that the "love powder" would counteract the old man's opposition; but from her subsequent conduct, as proved by the evidence, it is incredible that Mary acted in ignorance of the true purpose of the wise woman's prescription.
In April, or the beginning of May, 1751, by Miss Blandy's statement, she received from her lover a letter informing her that he had seen his old friend Mrs. Morgan, who was to oblige him with a fresh supply of her proprietary article, which he would send along with some "Scotch pebbles" for his betrothed's acceptance. "Ornaments of Scotch pebbles," says Lady Russell, "were the extreme of fashion in the year 1750." According to the opening speech for the Crown, both powder and pebbles arrived at Henley in April; Mary says they did not reach her hands till June. Susan Gunnell, one of the maidservants, stated at the trial that there were two consignments of pebbles from Scotland; one "in a large box of table linen," which came "early in the spring," and another in "a small box," some three months before her master's death. Cranstoun's instructions were "to mix the powder in tea." While professing to doubt "such efficacy could be lodged in any powder whatsoever," and expressing the fear "lest it should impair her father's health," Mary consented to give the love philtre a fair trial. "This some mornings after I did," she says in her Own Account.
Of the earlier phases of Francis Blandy's fatal illness, which began in this month of June, the evidence tells us nothing more definite than that he suffered much internal pain and frequently was sick; but two incidents occurring at that time throw some light upon the cause of his complaint. It was the habit of the old man to have his tea served "in a different dish from the rest of the family." One morning Susan Gunnell, finding that her master had left his tea untasted, drank it; for three days she was violently sick and continued unwell for a week. On another occasion Mr. Blandy's tea being again untouched by him, it was given to an old charwoman named Ann Emmet, often employed about the house. She shortly was seized with sickness so severe as to endanger her life. That Mary knew of both these mysterious attacks is proved; she was much concerned at the illness of the charwoman, who was a favourite of hers, and she sent white wine, whey, and broth for the invalid's use.
It is singular that such experiences failed to shake Miss Blandy's faith in the harmless nature of Mrs. Morgan's nostrum, but they at least made her realise that tea was an unsuitable vehicle for its exhibition, and she communicated the fact to Cranstoun. Her bloodthirsty adviser, however, was able to meet the difficulty. On 18th July he wrote to her, "in an allegorical manner," as follows:—"I am sorry there are such occasions to clean your pebbles; you must make use of the powder to them by putting it in anything of substance wherein it will not swim a-top of the water, of which I wrote to you in one of my last. I am afraid it will be too weak to take off their rust, or at least it will take too long a time." As a further inducement to her to hasten the work in hand, he described the beauties of Scotland, and mentioned that his mother, Lady Cranstoun, was having an apartment specially fitted up at Lennel House for Mary's use. The text of this letter was quoted by Bathurst in his opening speech for the Crown, but the report of the trial does not bear that the document itself was produced, or that it was proved to be in Cranstoun's handwriting. The letter is quoted in the Secret History and referred to in other contemporary tracts, and the fact of its existence appears to have been well known at the time. Further, Miss Blandy in her Own Account distinctly alludes to its receipt, and no objection was taken by her or her counsel to the reading of it at the trial. The point is of importance for two reasons. Firstly, this letter, if written by Cranstoun and received by Mary affords the strongest presumptive proof of their mutual guilt. Had their design been, as she asserted, innocent, what need to adopt in a private letter this "allegorical" and guarded language? Secondly, Mary, as we shall see, found means before her arrest to destroy the half of the Cranstoun correspondence in her keeping, and it would have been more satisfactory if the prosecution had shown how this particular letter escaped to fall into their hands. That she herself fabricated it in order to inculpate her accomplice is highly improbable; had she done so, as Mr. Bleackley has pointed out, its contents would have been more consistent with her defence.
On the evening of Sunday, 4th August, Susan Gunnell, by order of her mistress, made in a pan a quantity of water gruel for her master's use. On Monday, the 5th, Miss Blandy was seen by the maids at mid-day stirring the gruel with a spoon in the pantry. She remarked that she had been eating the oatmeal from the bottom of the pan, "and taking some up in the spoon, put it between her fingers and rubbed it." That night some of the gruel was sent up in a half-pint mug by Mary for her father's supper. When doing so, she repeated her curious action of the morning, taking a little in a spoon and rubbing it. On Tuesday, the 6th, the whole house was in confusion: Mr. Blandy had become seriously ill in the night, with symptoms of violent pain, vomiting, and purging. Mr. Norton, the Henley apothecary who attended the family, was summoned—at whose instance does not appear—and on arriving at the house he found the patient suffering, as he thought, from "a fit of colic." He asked him if he had eaten anything that could have disagreed with him; and Mary, who was in the bedroom, replied "that her papa had had nothing that she knew of, except some peas on the Saturday night before." Not a word was said about the gruel; and Mr. Norton had no reason to suspect poison. He prescribed, and himself brought certain remedies, promising to call next day. In the afternoon Miss Blandy, in the kitchen, asked Elizabeth Binfield, the cook, this strange question: "Betty, if one thing should happen, will you go with me to Scotland?" to which Betty cautiously replied, "If I should go there and not like it, it would be expensive travelling back again." That evening Susan was told to warm some of the gruel for her master's supper; she did so, and Mary herself carried it to him in the parlour. On going upstairs to bed, he was repeatedly sick, and called to Susan to bring him a basin.
Next morning, Wednesday, the 7th, Betty Binfield brought down from the bedroom the remains of Mr. Blandy's supper. Old Ann Emmet, the charwoman, chanced, unhappily for herself, to be in the kitchen. Susan told her she might eat what had been left, which she did, with the result that she too became violently ill, with symptoms similar to those of Mr. Blandy, and even by the following spring had not sufficiently recovered to be able to attend the trial of her benefactress. When Susan, at nine o'clock, went up to dress her mistress and informed her of her protegee's seizure, Miss Blandy feelingly remarked that she was glad she had not been downstairs, as it would have shocked her to see "her poor dame" so ill. The doctor called in the forenoon and found his patient easier. Later in the day Mary said to Susan that as her master had taken physic, he would require more gruel, but as there was still some left, she need not make it fresh "as she was ironing." Susan replied that the gruel was stale, being then four days old, and, further, that having herself tasted it, she felt very ill, upon which facts Mary made no comment. She thoughtfully warned the cook, however, that if Susan ate more of the gruel "she might do for herself—a person of her age," from which we must infer that Susan was much her master's senior; how, otherwise, was the old man to take it daily with impunity?
The strange circumstances attending this gruel aroused the maids' suspicions. They examined the remanent contents of the pan—the aged but adventurous Susan again tasting the fatal mixture was sick for many days—and found a white, gritty "settlement" at the bottom. They prudently put the pan in a locked closet overnight. Next day, Thursday, the 8th, Susan carried it to their neighbour, Mrs. Mounteney, who sent for Mr. Norton, the apothecary, by whom the contents were removed for subsequent examination, the result of which will in due course appear.
Meanwhile, Mary's uncle, the Rev. Mr. Stevens, of Fawley, having heard of his brother-in-law's illness, arrived on Friday, the 9th. To him Susan communicated the suspicious circumstances already mentioned, and he advised her to tell her master what she knew. Accordingly, at seven o'clock the following morning (Saturday, the 10th), Susan entered her master's bedroom, and broke to him the fearful news that his illness was suspected to be due to poison, administered to him by his own daughter. So soon as he had recovered from the first shock of this terrible intelligence, the old attorney asked her where Mary could have obtained the poison—he does not seem to have questioned the fact of its administration—and Susan could suggest no other source than Cranstoun. "Oh, that villain!" cried the sick man, realising in a flash the horrid plot of which he was the victim, "that ever he came to my house! I remember he mentioned a particular poison that they had in their country." Susan told him that Mr. Norton advised that Miss Blandy's papers be seized forthwith, but to this Mr. Blandy would not agree. "I never in all my life read a letter that came to my daughter," said the scrupulous old man; but he asked Susan to secure any of the powder she could find.
Determined at once to satisfy himself of the truth, Mr. Blandy rose and went downstairs to breakfast. There was present at that meal, besides himself and Mary, one Robert Littleton, his clerk, who had returned the night before from a holiday in Warwickshire. The old man appeared to him "in great agony, and complained very much." Mary handed her father his tea in his "particular dish." He tasted it, and, fixing his eyes upon her, remarked that it had a bad, gritty taste, and asked if she had put anything into it. The girl trembled and changed countenance, muttering that it was made as usual; to hide her confusion she hurried from the room. Mr. Blandy poured his tea into "the cat's basin" and sent for a fresh supply. After breakfast, Mary asked Littleton what had become of the tea, and, being told, seemed to him much upset by the occurrence. When the old man had finished his meal, he went into the kitchen to shave. While there he observed to his daughter, in presence of Betty Binfield, "I had like to have been poisoned once," referring to an occasion when he and two friends drank something hurtful at the coffee house. "One of these gentlemen died immediately, the other is dead now," said he; "I have survived them both, and it is my fortune to be poisoned at last," and, looking "very hard" at her, he turned away.
Miss Blandy must have been blind indeed had she failed to see the significance of these incidents. Anything but obtuse, she at once decided to take instant measures for her own protection. She went up to her room, and collecting Cranstoun's correspondence and what remained of the fatal powder, she returned to the kitchen; standing before the fire on pretence of drying the superscription of a letter, she threw the whole bundle into the grate and "stirred it down with a stick." The cook at the moment, whether by chance or design, put on some coals, which preserved the papers from flaming up, and as soon as their mistress had left the kitchen, the maids, now thoroughly on the alert, took off the coal. The letters were consumed, but they drew out almost uninjured a folded paper packet, bearing in Cranstoun's hand the suggestive words, "The powder to clean the pebbles with," and still containing a small quantity of white powder, which they delivered to Mr. Norton when he called later in the day. The apothecary found his patient worse, and stated his opinion to Mary, who asked him to bring from Reading the great Dr. Anthony Addington (father of Lord Sidmouth). Did she at the eleventh hour, pausing upon her dreadful path, seek yet to save her father's life, or was this merely a move to show her "innocence," as Dr. Pritchard, in similar circumstances, invited an eminent colleague to visit his dying victims? Both in her Narrative and her Own Account Mary takes full credit for calling in Dr. Addington, but she is unable to allude to the episodes of the parlour and the kitchen.