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Gerard Terburg, whose pictures now have an enormous value, had two sisters, Maria and Gezina, whose genre pictures were not unworthy of comparison with the works of their famous brother. Gottfried Schalken, remarkable for his skill in the representation of scenes by candle light, was scarcely more famous than his sister Maria. Eglon van der Neer is famous for his pictures of elegant women in marvellous satin gowns. He married Adriana Spilberg, a favorite portrait painter. The daughters of the eminent engraver Cornelius Visscher, Anna and Maria, were celebrated for their fine etching on glass, and by reason of their poems and their scholarly acquirements they were called the "Dutch Muses," and were associated with the learned men of their day. This list, though incomplete, suggests that the co-education of artists bore good fruit in their co-operation in their profession.

Weights of less than 0.01 gram are generally present in a box, but it is much more convenient to work with a rider. This is a piece of wire which in the pan weighs 0.01 gram; it is made in such a form that it will ride on the beam, and its effective weight decreases as it approaches the centre. If the arm of the beam is divided into tenths, then each tenth counting from the centre outward equals 0.001 gram or 1 milligram, and if these tenths be further subdivided the fractions of a milligram are obtained; and these give figures in the fourth place of decimals. A fairly good balance should be sensitive to 0.0001 gram. The weights must never be touched with the fingers, and the forceps for moving them is used for no other purpose. When not in actual use the box is kept closed. The weights must not be allowed to remain on the pan of the balance. The balance-case must not be open without some reason. It must be fixed level, and, once fixed, must not be needlessly moved. The bench on which it stands should be used for no other purpose, and no one should be allowed to lean upon it.

Boilers Nos. 21, 22 and 23, with a few modifications, are now the standard forms. These designs are illustrated, as they are constructed to-day, on pages 48, 52, 54, 58 and 60. The last step in the development of the water-tube boiler, beyond which it seems almost impossible for science and skill to advance, consists in the making of all pressure parts of the boiler of wrought steel, including sinuous headers, cross boxes, nozzles, and the like. This construction was the result of the demands of certain Continental laws that are coming into general vogue in this country. The Babcock & Wilcox Co. have at the present time a plant producing steel forgings that have been pronounced by the _London Engineer_ to be "a perfect triumph of the forgers' art".

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