The record of the Valladolid trial likewise reveals to us some of Luis de Leon's intellectual foibles. But these were extremely few. Towards the end of the proceedings at Valladolid the Inquisitionary judges there summoned before them Juan Galvan, a young theological student who lodged with Salinas, the blind musician. Galvan testified that for about two years he had discussed matters of theology, mathematics, and astrology with Luis de Leon.[172] It may astonish some that Luis de Leon toyed with the pseudo-science of astrology: it cannot have surprised his judges for, on April 18, 1572, while still bewildered as to the cause of his arrest, he had stated to them in writing that he had read a compilation on astrology which had been lent to him by a student named Poza, a licentiate in canon law. Poza seems to have doubted whether he ought to keep such a work, and consulted Luis de Leon on the question. Luis de Leon dipped into the book, and came finally to the conclusion that the whole thing was rubbish. But he found in the work some curious observations, and was tempted to make at least one experiment which involved the use of a pious formula. The owner of the book left Salamanca to avoid an epidemic which was then raging there. Luis de Leon had expected a visit from Poza that day, and had intended to burn the volume in Poza's presence. He carried out the main part of his intention by burning the work in the presence of Fray Bartolomé de Carranza, to whom he explained the meaning of this holocaust. No more was heard of Poza; yet it seems that Luis de Leon's curiosity as to the possibilities of astrology continued with but little abatement.[173] This half-belief in astrology as a kind of black art was widespread during the sixteenth century, and vestiges of this ingenuous credulity have survived in unexpected quarters till our own time. It was perhaps unwise of Luis de Leon thus to furnish his adversaries with ammunition which they might use against him; but could anything bespeak conscious innocence more strongly than his voluntary avowal?