Mr. Swan, proceeding still further, secured the services of two of the most distinguished professors of chemistry in this country, Messrs. Markoe and Baird, and submitted to them in camera sixty-seven samples of different inks, known only by numbers, for chemical analysis; in a long and exhaustive report on the work they had set out to accomplish, and also with a dissertation on the chemistry of inks in general, they complete their report as follows: "As a conclusion, since the great mass of inks on the market are not suitable for records, because of their lack of body and because of the quantity of unstable color which they contain, and because the few whose coloring matters are not objectionable are deficient in galls and iron, or both, we would strongly recommend that the State set its own standard for the composition of inks to be used in its offices and for its records, have the inks manufactured according to specifications sent out, and receive the manufactured products subject to chemical assay. In this way only can there be a uniformity in the inks used for the records throughout the State, and in no other way can a proper standard be maintained." Mr. Swan comments on the report of his chemists, and calls attention to other tests made by himself: "The conclusions at which I arrived were drawn, as stated, from manufacturers or recording officers, wholly independently of the chemists, but they will be found to coincide in many particulars with theirs. I did consult them in regard to the practicability of maintaining a State standard for record ink, which they have approved. "The commendation by the chemists of some of the so-called writing fluids explains in a degree the variety of opinions advanced by the manufacturers in regard to the durability of fluids. Some of them will be seen to possess the qualities of ink, and the name fluid is evidently given to meet the commercial demand for fluids. "Several persons, manufacturers among them, expressed greater confidence in tests of exposure of inks to the light and weather than to chemical analysis. I, therefore, as a dry test, placed on the inside of a window pane receiving a strong light, writing made under exactly the same conditions with each of sixty-seven inks, which remained there from March 13 to December 8. Similar writing was exposed to light and the weather from September 25 to December 8, and the result of the resistance of the inks in both tests is an almost exact confirmation of the report of the chemists, inks of the same class varying in their resistance according to their specific gravity or amount of added color.