1049. Homogeneous Light
A. MS., n.p., n.d., 2 pp.
Outline of a series of twenty experiments.

1050. [On Astronomical Magnitude]
A. MS., n.p., [1878], 28 pp.
Draft of abstract G-1878-6.

1051. [Notes on the Zodiac of Denderah]
A. MS., from a notebook, n.p., n.d., 23 pp.

1052. Zodiac (later list of Epping and Strassmaier)
A. MS., n.p., n.d., 4 pp.

1053. Outline of the Idea of an Almanac
A. MS., n.p., n.d., 1 p.; plus 2 pp. on same topic.

1054. (Gothic Period)
A. MS., n.p., n.d., pp. 1-10.
Comparison of star catalogues from Ptolemy on down.

1055. Record of C. S. Peirce's Photometric Observations
A. MS., notebook, n.p., May 4-June 10, 1872.

1056. Phyllotactic Numbers
A. MS., n.p., n.d., 25 pp.

1057. Tables to find the place of Juppiter at any given date
A. MS., n.p., n.d., 4 pp.

1058. Tracings showing our Groups of Stars 40 °-50° N as they appear in Argelander
A. MS., n.p., n.d., 5 pp.

1059. [Fragments]
A. MS., n.p., n.d., over 800 pp.
Records of observation and calculations used in CSP's photometric researches and in other volumes in The Annals of the Harvard College Observatory.