common property as air and sunlight, and the tool or device invented to aid in their use. Again, it is a notorious fact that the great multiplicity of inventions has made the search to determine the novelty of any article submitted for a patent for the most part a farce. No one is competent nowadays to say surely of any ordinary mechanical device that it is absolutely new. The bulky volumes of Patent-Office reports are for the most part a hodge-podge of crude ideas, repeated over and over again under different names, with just enough valuable matter, in the shape of the inventions of practical mechanical designers and educated inventors, to save the volumes from being an entire waste of paper and ink. Space, however, will not permit us to discuss at length the faults of our patent system. The important point for us to notice is that the patent system establishes certain monopolies, and that these monopolies are not always harmless. Patents are given to "promote the useful arts," but the inventor whom they are supposed to encourage reaps but a small share of the profits of his inventions. Valuable improvements soon fall into the hands of large companies, who are able to defend them in the courts, and reap all possible profits by their use. Again, patents sometimes aid in the formation of trusts and combinations. Two or three firms may control all the valuable patents in connection with some important industry. If they agree to combine their interests and work in harmony, they are far stronger than an ordinary trust, because the patents they hold prevent outside competition. It was pointed out in the opening chapter how the control of patents was sometimes a feature helping to induce the formation of trusts. The Standard Oil Trust had its origin in the superiority which one firm gained over its competitors through the control of an important patent. The envelope trust, which, at this date, has raised the price of envelopes about twenty per cent., owes its chief strength to its control of patents on the machines for making the envelopes. Instances innumerable could be given where a few manufacturers, who by their ownership of patents controlled the whole field, have ended a fierce competition by consolidating or agreeing to work together harmoniously in the matter of selling-prices. Very many of these are monopolies in trade or monopolies in manufacturing, and as such have already been considered in the preceding chapters; but it is proper here to point out the part which our patent system has taken in their formation, and the fact that it is due to their control of patents that many of the existing combinations owe their security against outside competition.