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The eighth chapel is that of the Sposalizio, is certainly not by Aureggio, and I should say was mainly by the same sculptor who did the Presentation in the Temple. On going inside I found the figures had come from more than one source; some of them are constructed so absolutely on Valsesian principles, as regards technique, that it may be assumed they came from Varallo. Each of these last figures is in three pieces, that are baked separately and cemented together afterwards, hence they are more easily transported; no more clay is used than is absolutely necessary; and the off-side of the figure is neglected; they will be found chiefly, if not entirely, at the top of the steps. The other figures are more solidly built, and do not remind me in their business features of anything in the Valsesia. There was a sculptor, Francesco Sala, of Locarno (doubtless the village a short distance below Varallo, and not the Locarno on the Lago Maggiore), who made designs for some of the Oropa chapels, and some of whose letters are still preserved, but whether the Valsesian figures in this present work are by him or not I cannot say.

A device often adopted in practice where a large number of assays of one kind are made, and the report is given as so many ounces or pounds to the ton, is that known as the _assay ton_. The assay ton may be any arbitrary and convenient weight, but its subdivisions must bear to it the same relations as pounds and ounces bear to the actual ton. On the other hand, in a laboratory where many kinds of work are performed, different sets of weights of this kind would only tend to confusion, even if they were not unnecessary. With a set of gram weights and its subdivisions anything may be done. If it is desired to report as pounds to the ton, then, since there are 2240 lbs. to the ton, a weight of 2.240 grams may be taken as the assay ton, and each 0.001 gram yielded will equal 1 lb., or 22.4 grams may represent the ton, and each 0.01 gram a pound. Similarly, since there are 32,666.6 ozs. troy to the ton; if we take 32.6667 grams as the assay ton, each 0.001 gram will equal 1 oz. to the ton. In some cases it may be convenient to have, in addition to the usual gram weights, one or other of the "assay tons" mentioned above, but generally it is better to work on a purely decimal system, and convert when required into ounces per ton, &c., either by actual calculation or by reference to a set of tables.

Dry Steam--In the list of the requirements of the perfect steam boiler, the necessity that dry steam be generated has been pointed out. The Babcock & Wilcox boiler will deliver dry steam under higher capacities and poorer conditions of feed water than any other boiler now manufactured. Certain boilers will, when operated at ordinary ratings, handle poor feed water and deliver steam in which the moisture content is not objectionable. When these same boilers are driven at high overloads, there will be a direct tendency to prime and the percentage of moisture in the steam delivered will be high. This tendency is the result of the lack of proper circulation and once more there is seen the advantage of the headers of the Babcock & Wilcox boiler, resulting as it does in the securing of a positive circulation.

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