- Owner's entry on frontwr./ stamp on title-p. Lacks backwr./ backstrip; frontwr. top edge strengthened w. scotch tape.

= From the library of Jacob Clay (1882-1955).

WITH loosely inserted: Idem, "Het relativiteitsbeginsel II/ III", 3,(1); 6p.

- Second booklet w. owner's annots.; 3rd booklet first leaf w. tear of 12 cm. in inner margin. Rare.

Cassirer, E. Zur Einstein'schen Relativitätstheorie: Erkenntnistheoretische Betrachtungen. Berlin, B. Cassirer, 1921, 1st ed., 134,(2)p., orig. wr.

- Owner's entry on title-p. Wrappers (sl.) sunned along extremities; spine-ends dam.

= DSB III, p.112.

Eddington, A.S. Relativitätstheorie in mathematischer Behandlung. German transl. A. Ostrowski and H. Schmidt. Ibid., J. Springer, 1925, XIV,377,(5)p., orig. cl.

- Spine-ends sl. worn. Contents fine. = Cf. DSB IV, p.282.

AND 3 others similar, i.a. IDEM, Raum, Zeit und Schwere. German transl. W. Gordon (Braunschweig, 1923, orig. (stained) cl.) and R.C. TOLMAN, Relativity, Thermodynamics and Cosmology (Oxf., 1934, orig. cl. w. giltlettered spine).