The preceding commendations, however, will not extend to the whole of Guido's works. His inequality is well known, but not owing to any maxim of his art. It arose from his love of play, a failing which obscured his many moral qualities. His profits were great; but he was kept continually in a state of indigence by his losses, which he endeavoured to repair by the too negligent practice of his art. Hence we trace occasional errors in perspective, and deficiency of invention, a defect so much insisted upon by the implacable Albani. Hence too his incorrectness of design, the disproportion of his figures, and his works put to sale before their completion. Yet these are not excluded from royal cabinets, and that of Turin possesses one of Marsyas, a finely finished figure, before which is seen standing little more than the sketch of an Apollo. To form then a fair estimate of Guido, we must turn to other efforts which raised him to high reputation. Among his most excellent pieces I am of opinion that his Crucifixion of St. Peter, at Rome, is a specimen of his boldest manner; the Miracle of the Manna at Ravenna, the Conception at Forli, the Slaughter of the Innocents at Bologna; and there too his celebrated picture of Saints Peter and Paul in the Casa Sampieri. Specimens of his more tender manner may be found in the St. Michael at Rome, the Purification at Modena, the Job at Bologna, St. Thomas the Apostle at Pesaro, the Assumption at Genoa, one of Guido's most studied pieces, and placed directly opposite the St. Ignatius of Rubens.