From the date of Hogg's departure from London (18th April) to the middle of May, when he went into Sussex, Shelley saw much of both sisters. Seeing Harriett in Chapel Street, he saw her also at the Clapham school, which he described as the young lady's 'prison-house.' Accompanying Elizabeth in an excursion to the 'prison-house,' he on one occasion spent two hours, walking about Clapham Common with the two sisters. On another occasion, he hastened in the evening (at the elder sister's invitation) to Chapel Street, where he found Harriett ill and suffering from headache. After talking for some time with the elder sister, on love and other interesting subjects, he found himself closeted with Harriett, in the absence of Elizabeth, who left the boy and girl together: her complaisance going so far that Shelley sate in private conference with the beauty of the Clapham boarding-school till past midnight. Shelley, of course, availed himself of so good an opportunity for enlarging the child's views of love and religion. By this time, Harriett had learnt a good deal on these matters from her future husband, and had proved so apt a pupil as to be in disgrace at Clapham for uttering sentiments of his teaching. The girls of the school were holding aloof from Harriett, on account of her awfully wicked opinions: some of them even going so far as to call her 'an abandoned wretch.' Shelley was under the impression that his little sister Hellen was the only one of the girls brave enough to hold friendly intercourse with Harriett, under the odium she had provoked. In his delight at his little sister's courage, he determined to seize the earliest opportunity of illuminating her out of the Christian faith. 'There are,' he wrote to Hogg, 'hopes of this dear little girl: she would be a divine little scion of infidelity. I think my lesson to her must have taken effect.' Thus he was already taking measures to convert his little sister (still in her thirteenth year) to atheism. At Keswick (1811-12) Shelley told Southey (_vide_ _Correspondence of Robert Southey with Caroline Bowles_, 1881) that he endeavoured to make proselytes to atheism in Mrs. Fenning's school; that he succeeded in making a proselyte of Harriett; and that he married her, because she was expelled from the school for accepting his doctrine, and doing her best to induce her schoolfellows to accept it. 'One of the girls,' Southey wrote to Shelley in August, 1820, 'was expelled for the zeal with which she entered into your views, and you made her the most honourable amends in your power by marrying her.... I had this from your own lips.' The words thus spoken by Shelley to Southey must be read with suspicion, like all Shelley's other statements about himself and his own affairs. There is the more need for caution in this case, as Shelley certainly suffered from delusions at Keswick, and made Southey other statements clearly referable to hallucination.