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~Filtration.~--Solutions are best filtered hot whenever the assay allows of this being so done. The precipitate should be allowed to settle, and the clear liquid decanted on the filter with the aid of a glass rod if necessary. The filter-paper must not be too large, but at the same time it must not be overloaded with the precipitate. There should be ample room for washing. For general use three sizes of filter-paper are sufficient. Common quick filtering-paper (English) is best for most work in assaying. The specially prepared paper (Swedish or Rhenish) is used for collecting those precipitates which have to be weighed. The papers are folded as shown in fig. 16, and should not project above the funnel. The filter-paper works better if damped with hot water. In special cases filtering is hastened by means of an air-pump. The apparatus used consists of a water-jet (fig. 17), which is connected with the tap, as also with a bottle fitted as shown in fig. 18. The pump draws the air out from the bottle, and atmospheric pressure forces the liquid through the filter-paper. The bottom of the funnel is provided with a platinum cone, which supports the filter-paper, and prevents its breaking. The pump is only used in exceptional cases; nearly all the filtrations required by the assayer can be made without it. The usual methods of supporting the funnel during filtration are shown in fig. 19. Where the filtrate is not wanted, pickle bottles make convenient supports. After the precipitate has been thrown on the filter, it is washed. In washing, several washings with a small quantity of water are more effective than a few with a larger quantity of that fluid. The upper edge of the filter-paper is specially liable to escape complete washing. Excessive washing must be avoided; the point at which the washing is complete is found by collecting a little of the filtrate and testing it. The precipitate is removed from the filter-paper for further treatment by opening out the paper and by washing the precipitate with a jet of water from a wash-bottle into a beaker, or back through the funnel into the flask. In some cases, when the precipitate has to be dissolved in anything in which it is readily soluble, solution is effected in the filter itself allowing the liquid to run through as it is formed.

As Romulus was the founder of the political institutions of Rome, so Numa was the author of the religious institutions. Instructed by the nymph Egeria, whom he met in the sacred grove of Aricia, he instituted the Pontiffs, four in number, with a Pontifex Maximus at their head, who had the general superintendence of religion; the Augurs, also four in number, who consulted the will of the gods on all occasions, both private and public; three Flamens, each of whom attended to the worship of separate deities--Jupiter,[5] Mars, and Quirinus; four Vestal Virgins, who kept alive the sacred fire of Vesta brought from Alba Longa; and twelve Salii, or priests of Mars, who had the care of the sacred shields.[6] Numa reformed the calendar, encouraged agriculture, and marked out the boundaries of property, which he placed under the care of the god Terminus. He also built the temple of Janus, a god represented with two heads looking different ways. The gates of this temple were to be open during war and closed in time of peace.

In the parish church at Saas-Grund there are two altar-pieces which deserve attention. In the one over the main altar the arrangement of the Last Supper in a deep recess half-way up the composition is very pleasing and effective; in that above the right-hand altar of the two that stand in the body of the church there are a number of round lunettes, about eight inches in diameter, each containing a small but spirited group of wooden figures. I have lost my notes on these altar-pieces and can only remember that the main one has been restored, and now belongs to two different dates, the earlier date being, I should imagine, about 1670. A similar treatment of the Last Supper may be found near Brieg in the church of Naters, and no doubt the two altar-pieces are by the same man. There are, by the way, two very ambitious altars on either side the main arch leading to the chance in the church at Naters, of which the one on the south side contains obvious reminiscences of Gaudenzio Ferrari's Sta. Maria frescoes at Varallo; but none of the four altar-pieces in the two transepts tempted me to give them much attention. As regards the smaller altar-piece at Saas-Grund, analogous work may be found at Cravagliana, half-way between Varallo and Fobello, but this last has suffered through the inveterate habit which Italians have of showing their hatred towards the enemies of Christ by mutilating the figures that represent them. Whether the Saas work is by a Valsesian artist who came over to Switzerland, or whether the Cravagliana work is by a Swiss who had come to Italy, I cannot say without further consideration and closer examination than I have been able to give. The altar-pieces of Mairengo, Chiggiogna, and, I am told, Lavertezzo, all in the Canton Ticino, are by a Swiss or German artist who has migrated southward; but the reverse migration was equally common.

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