Under all these discouragements Mr. Miller was constantly writing the most urgent letters from Georgia, to press forward the manufacture of machines. "Do not let a deficiency of money, do not let anything," says Mr. Miller, "hinder the speedy construction of the gins. The people of the country are almost running mad for them, and much can be said to justify their importunity. When the present crop is harvested, there will be a real property of at least $50,000, yes, of $100,000, lying useless, unless we can enable the holders to bring it to market. Pray remember that we must have from fifty to one hundred gins between this and another fall, if there are any workmen in New England or in the Middle States to make them. In two years we will begin to take long steps up-hill, in the business of patent ginning, fortune favoring." The general resort of the planters to the cultivation of cotton, and its consequent production in vast quantities, the value of which depended entirely upon the chance of getting it cleaned by the gin, created great uneasiness, which first displayed itself in this pressure upon Miller & Whitney, and afterward afforded great encouragement to the marauders upon the patent-right, who were now becoming numerous and audacious. The _roller-gin_ was at first the most formidable competitor with Whitney's machine. It extricated the seeds by means of rollers, crushing them between revolving cylinders, instead of disengaging them by means of teeth. The fragments of seeds which remained in the cotton rendered its execution much inferior in this respect to Whitney's gin, and it was also much slower in its operation. Great efforts were made, however, to create an impression in favor of its superiority in other respects. But a still more formidable rival appeared early in the year 1795, under the name of the _saw-gin_. It was Whitney's gin, except that the teeth were cut in circular rims of iron, instead of being made of wires, as was the case in the earlier forms of the patent gin. The idea of such teeth had early occurred to Mr. Whitney, as he afterward established by legal proof. But they would have been of no use except in connection with the other parts of his machine, and, therefore, this was a palpable attempt to evade the patent-right, and it was principally in reference to this that the lawsuits were afterward held.