1011. Introduction
A. MS., n.p., n.d., 14 pp.
Probably an introduction to an article on air-sailing. Problem of mechanical flight, including an historical account of researches on the problem, beginning with the work of K. H. Schellbach.

1012. Report of the First Experimental Run of the Air-Ship of Count von Zeppelin (Z)
A. MS., n.p., n.d., pp. 1-14, with 5 pp. of variants.
An account of the preparations made in 1899 and 1900 on Lake Constance for the first airship ascension. It is quite likely that the above is a translation made for Langley of the Smithsonian.

1013. The Prospects of Air-Sailing
A. MS., n.p., [1895], pp. 1-51, with an alternate p. 28.
Hydrodynamics involved in a fish's swimming upstream. Flight of birds. Professor Langley's theory of the aerodynamics of soaring. In general, CSP treats the kinds of problems and preparation required before an airship can be successfully launched. He thought that wind should be used as motive power. Prediction of success, with commercial value foreseen.

1014. The Prospects of Sailing the Air
A. MS., n.p., n.d., pp. 1-15, 17-21, 32-34, 53-57; plus fragments.

1015. [Mathematics of Aerodynamics]
A. MS., n.p., n.d., 10 pp.
The need for research in the mathematics of aerodynamics. Reference to Professor Langley's researches.

COLOR EXPERIMENTS

1016. Color Studies. Vol. 2. Qualitative Phenomena, Methods and Theories
A. MS., small red notebook ("Color Miscellaneous" written on the cover), n.p., n.d., with exception of entries on p. 27 (6/9/866/28/87).
Fechner's Law applied to color, Spectra. Theory of Luminosity. Tables reporting the results of several experiments.

1017. [Hue Studies]
A. MS., small red notebook ("Hue" written on the cover), n.p., April 4, 1889, with many pages missing.

1018. [Color Experiments]
A. MS., small brown notebook, n.p., the notebook bought in K^ln, March 6, 1876, with numerous dates throughout, the last of which (p. 71) is February 15, 1877-
Extensive notes on color experiments; brief notes on logic, specifically premises and leading principles.

1019. [Color Experiment]
A. MS., n.p., n.d., 7 pp. of tables.

1020. Calc. of Wave Lengths of Maxwell's Primary Colours
A. MS., n.p., n.d., pp. 1-3.

1021. Scale of Maxwell's Second Colour-Box compared with Angstr^m's wave lengths
A. MS., n.p., n.d., 1 p.

1022. Memorandum of Studies to be made on Color
A. MS., n.p., n.d., 1 p.

1023. [Color Study]
Small envelope containing scraps of colored ribbon numbered in order of apparent brightness as determined by CSP on a dark day.

1024. [Fragments related to Color Experiments]
A. MS., n.p., n.d., 10 pp.

MISCELLANEOUS

1025. [Notes on Rates of Change of Radio-active Elements]
A. MS., n.p., n.d., 11 pp.

1026. The Principles of Mechanics
A. MS., n.p., [c.1878], 1 p., 3 pp., 3 pp., 4 pp., representing at least four tentative starts.
The three independent properties of time. Isochronous oscillations. Principle of living forces.

1027. Constants. A. Pure Physical Constants
A. MS., n.p., [c.1880], 1 p.

1028. Methods of Investigating the Constant of Space
A. MS., n.p., March 24, 1891, 2 drafts, 3 pp. each.

1029. [Fragments on Michelson-Morley Experiment on the Drift of Earth through the Ether]
A. MS., n.p., n.d., 6 pp.