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~Colorimetric Assays.~--These are assays in which the colour imparted to a solution by some compound of the metal to be determined is taken advantage of; the depth of colour depending on the quantity of metal present. They are generally used for the determination of such small quantities as are too minute to be weighed. The method of working is as follows:--A measured portion of the assay solution (generally 2/3, 1/2, 1/3, or 1/4 of the whole), coloured by the substance to be estimated, is placed in a white glass cylinder standing on a sheet of white paper or glazed porcelain. Into an exactly similar cylinder is placed the same amount of re-agents, &c., as the portion of the assay solution contains, and then water is added until the solutions are of nearly equal bulk. Next, a standard solution of the metal being estimated is run in from a burette, the mixture being stirred after each addition until the colour approaches that of the assay. The bulk of the two solutions is equalised by adding water. Then more standard solution is added until the tints are very nearly alike. Next, the amount added is read off from the burette, still more is poured in until the colour is slightly darker than that of the assay, and the burette read off again. The mean of the readings is taken, and gives the quantity of metal added. It equals the quantity of metal in the portion of the assay. If this portion was one-half of the whole, multiply by two; if one-third, multiply by three, and so on. When the quantity of metal in very dilute solutions is to be determined, it is sometimes necessary to concentrate the solutions by boiling them down before applying the re-agent which produces the coloured compound. Such concentration does not affect the calculations.

Once more I must caution the reader against expecting to find highly-finished gems of art in the chapels I have been describing. A wooden figure not more than two feet high clogged with many coats of paint can hardly claim to be taken very seriously, and even those few that were cut by Tabachetti himself were not meant to have attention concentrated on themselves alone. As mere wood-carving the Saas-Fee chapels will not stand comparison, for example, with the triptych of unknown authorship in the Church of St. Anne at Gliss, close to Brieg. But, in the first place, the work at Gliss is worthy of Holbein himself: I know no wood-carving that can so rivet the attention; moreover it is coloured with water-colour and not oil, so that it is tinted, not painted; and, in the second place, the Gliss triptych belongs to a date (1519) when artists held neither time nor impressionism as objects, and hence, though greatly better than the Saas-Fee chapels as regards a certain Japanese curiousness of finish and naivete of literal transcription, it cannot even enter the lists with the Saas work as regards elan and dramatic effectiveness. The difference between the two classes of work is much that between, say, John Van Eyck or Memling and Rubens or Rembrandt, or, again, between Giovanni Bellini and Tintoretto; the aims of the one class of work are incompatible with those of the other. Moreover, in the Gliss triptych the intention of the designer is carried out (whether by himself or no) with admirable skill; whereas at Saas the wisdom of the workman is rather of OberAmmergau than of the Egyptians, and the voice of the poet is not a little drowned in that of his mouthpiece. If, however, the reader will bear in mind these somewhat obvious considerations, and will also remember the pathetic circumstances under which the chapels were designed--for Tabachetti when he reached Saas was no doubt shattered in body and mind by his four years' imprisonment--he will probably be not less attracted to them than I observed were many of the visitors both at Saas-Grund and Saas-Fee with whom I had the pleasure of examining them.

And now I leave my subject, not without misgiving that I shall have disappointed you. But for the great attention which is being paid to the work from which I have quoted above, I should not have thought it well to insist on points with which you are, I doubt not, as fully impressed as I am: but that book weakens the sanctions of natural religion, and minimises the comfort which it affords us, while it does more to undermine than to support the foundations of what is commonly called belief. Therefore I was glad to embrace this opportunity of protesting. Otherwise I should not have been so serious on a matter that transcends all seriousness. Lord Beaconsfield cut it shorter with more effect. When asked to give a rule of life for the son of a friend he said, "Do not let him try and find out who wrote the letters of Junius." Pressed for further counsel he added, "Nor yet who was the man in the iron mask"--and he would say no more. Don't bore people. And yet I am by no means sure that a good many people do not think themselves ill-used unless he who addresses them has thoroughly well bored them--especially if they have paid any money for hearing him. My great namesake said, "Surely the pleasure is as great of being cheated as to cheat," and great as the pleasure both of cheating and boring undoubtedly is, I believe he was right. So I remember a poem which came out some thirty years ago in Punch, about a young lady who went forth in quest to "Some burden make or burden bear, but which she did not greatly care, oh Miserie." So, again, all the holy men and women who in the Middle Ages professed to have discovered how to make the best of life took care that being bored, if not cheated, should have a large place in their programme. Still there are limits, and I close not without fear that I may have exceeded them.

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