In 1719 four works proceeded from his increasingly fertile pen. “A Proposal for a Decimal System of Money and Measures;” “A Treatise on the Motion and Position of the Earth and Planets;” “Proofs derived from Appearances in Sweden, of the Depth of the Sea, and the greater Force of the Tides in the Ancient World;” and “On Docks, Sluices, and Salt Works.” His work on the Decimal system of coinage and measures was republished in 1795. Swedenborg’s ideas on this and most other subjects were far ahead of the times in which he lived. In one of his letters he thus alludes to the discouragements he met with on this account. “It is a little discouraging to me to be advised to relinquish my views, as among the novelties the country can not bear. For my part, I desire all possible novelties; aye, a novelty for every day in the year; for in every age there is an abundance of persons who follow the beaten track, and remain in the old way; while there are not more than from six to ten in a century who bring forward innovations founded on argument and reason.” CHAPTER III. _Travels again—Publishes five Scientific Pamphlets and “Miscellaneous Observations”—Returns Home and enters on the duty of his Assessorship—Writes his “Opera Philosophica et Mineralia,” and goes abroad to publish it._ In the spring of 1721, Swedenborg visited Holland a second time, and chose Amsterdam as a place of publication for the following five little works:—“Some Specimens of a Work on the Principles of Natural Philosophy, comprising New Attempts to Explain the Phenomena of Chemistry and Physics by Geometry;” “New Observations and Discoveries respecting Iron and Fire, and particularly respecting the Elemental Nature of Fire, together with a new construction of Stoves;” “A New Method of finding the Longitude of Places, on Land or at Sea, by Lunar Observations;” “A New Mechanical Plan of constructing Docks and Dykes;” and “A Mode of Discovering the Powers of Vessels by the application of Mechanical Principles.”