(Table 1) 87Sr/86Sr and Sr/Ca ratios in foraminiferal calcite from DSDP Holes 3-21 and 39-357

The 87Sr/86Sr ratio of ancient seawater, as recorded in marine carbonates, is an important tracer of long-term variations in ocean chemistry (Burke et al., 1982, doi:10.1130/0091-7613(1982)10<516:VOSSTP>2.0.CO;2; Peterman et al., 1970, doi:10.1016/0016-7037(70)90154-7; Dasch and Biscaye, 1971, doi:10.1016/0012-821X(71)90164-6; Veizer and Compston, 1974, doi:10.1016/0016-7037(74)90099-4; Brass, 1976, doi:10.1016/0016-7037(76)90025-9). However, the Sr isotope balance of the oceans has been difficult to constrain; consequently, attempts to evaluate the temporal 87Sr/86Sr changes have been largely qualitative. To constrain the causes of these variations we have measured 87Sr/86Sr ratios in carefully cleaned unrecrystallized foraminifera from DSDP sites 21 and 357. The data presented here have been quantitatively modelled taking advantage of recent advances in understanding of the Sr geochemical cycle. They suggest that whereas hydrothermal fluxes and carbonate recycling are of major importance in defining the marine 87Sr/86Sr ratio, the major control over its variations through the Cenozoic has been changes in the isotope composition of Sr derived from the weathering of silicate rocks.

Webster and Dexter Township (Mich.) residences, ca. 1874

Left to right: Res. of Samuel H. Ball, Sec 5, Webster Tp. Mich.; Res. of Alexander Mallion, Sec 28, Wester Tp., Mich.; Res. of J.B. Arms, Sec 4, Webster Tp. Mich.; Res. of Frederick Lee, Sec 30, Webster Tp. Mich.; Res. of Patrick Fleming, Sec 25, Dexter Tp. Mich.; Res. of W.. Brass, Sec 31, Webster Tp. Mich. Publication information: Chicago, Ill. : Everts & Stewart, 1874.

A treatise on brasses, bronzes, and other alloys : and their constituent metals /

Includes bibliographical references.

Feierlicher Einzug : für 12 Trompeten, 3 Solotrompeten, 4 Hörner, 4 Posaunen, 2 Tuben und Pauken /

Mode of access: Internet.

Legende : Quartett für vier Hörner in F /

Caption title.

Writing Table

Anonymous, English, 18C; 2 ft. 11 7/16 in. x 5 ft. 3 3/16 in. x 2 ft. 4 47/64 in.; mahogany and padouk, brass and gilt bronze

Bowl

Turanshan; 4 11/16 in.x 8 15/16 in.; brass with silver inlay

Basin of Sultan Qaytbay

Metalwork, Islamic, Mamluk; 5 in.x 1 ft. 2 31/64 in.; brass, inlaid with silver

Nucleation of voids in metals during diffusion and creep /

Experimental evidence is presented which proves that voids formed during diffusion in brass are heterogeneously nucleated. The nuclei appear to be oxide particles, probably ZnO. When these are removed by re-melting, voids practically do not form upon subsequent dezincification. Brass which had been freed of void nucleation catalysts exhibited a considerably reduced tendency for grain boundary cracking during creep, and increased stress-rupture life.

Professor E. Haeckel's Darstellungs und Kampfesweise sachlich dargelegt ...

Each plate has descriptive text on verso.

Purcell ode, and other poems,

Also published, London, 1896, under title: Ode for the Bicentenary commemoration of Henry Purcell. With other poems...