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Updated: June 13, 2025
The wide road is macadamised and marked with kilometre stones, and is planted on either side with pepper-trees, plane-trees, and the Eucalyptus globulus, which has grown 35 metres, or 115 feet, in seven years. The hedges are formed of blue plumbago, scarlet geranium, yellow acacia, lavender-coloured heliotrope, white jasmine, and pink and white roses.
Even non-metallic surfaces could be reproduced in copper by taking a cast of them in wax and lining the mould with fine plumbago, which, being a conductor, served as a cathode to receive the layer of metal. It is by the process of electrotyping or galvano- plastics that the copper faces for printing woodcuts are prepared, and copies made of seals or medals.
The space, f, between these two cylinders, d e, is filled with a mixture of plumbago and lampblack of suitable resistance, confined at the ends by ivory disks.
Virginia, "the mother of Presidents," is rich in minerals of the more useful sort, and some of the precious metals. Her list of mineral treasures includes gold, copper, iron, lead, plumbago, coal, and salt. The gold mines are not available except to capitalists, and it is not yet fully settled whether the yield is sufficient to warrant large investments.
Now, if we consider that every species of coal and every species of plumbago are equally, that is, perfectly combustible, and yield, in burning, the same volatile principles, differing only perhaps a little in the small quantity of fixed matter which remains, we shall be inclined to believe, that they have all the same origin in a vegetable substance; and that they are diversified by some very small composition of other matter.
Mineral and Pigment Dyestuffs. These colours are insoluble in water and alcohol. They are either fixed on the fibre by mechanical means or by precipitation. For example, you use blacklead or plumbago to colour or darken your hats, and you work on this pigment colour by mechanical means. I will show you by experiment how to fix a coloured insoluble pigment in the fibre.
"Now, you darling old bear, we won't harp on that twice-told tale again," Clara interrupted, with a knowing smile. "Point da rechauffes! Let us leave one another's misdeeds and one another's explanations for their proper sphere the family circle. The orchids did NOT turn up, that is the point; and I managed to make shift with the plumbago and the geraniums.
"Well yes, when it attacks one's deadly enemy." "I've cut it down, and trimmed it out, and tied it up," said the gardener. He meant the Plumbago capense! That man never would allow that he was beaten. My eldest boy one day held some pansies over the fumes of ammonia, turned them green, and showed them as a lusus naturae to the gardener. He smiled contemptuously.
While Siemens was testing the chemical and life-promoting influence of the electric arc light, he was also occupied in trying its temperature and heating power with an 'electric furnace, consisting of a plumbago crucible having two carbon electrodes entering it in such a manner that the voltaic arc could be produced within it.
In that first week of January already mentioned the present writer saw at every turn, in such borders and in leaf and blossom, the delicate blue-flowered plumbago; two or three kinds of white jasmine, also in bloom; and the broad bush-form of the yellow jasmine, beginning to flower.
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