The Whence and the Whither of Man. A brief history of his origin and development through conformity to environment. Being the Morse Lectures of 1895 / by John M. Tyler.

Date:
1896
Catalogue details

Licence: Public Domain Mark

Credit: The Whence and the Whither of Man. A brief history of his origin and development through conformity to environment. Being the Morse Lectures of 1895 / by John M. Tyler. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

    85/370 (page 63)
    tubes. Transverse vessels run from these to all parts of the body. The dorsal tube pulsates and thus acts as a heart. The surface of the body no longer suffices to gather oxygen, hence we find special feathery gi s on the parapodia. But these gills are merely expanded 8. CROSS-SECTION OP BODY SEGMENT OP ANNELID. LANS. dp and vp, dorsal and ventral halves of parapodia ; b and ac, bristles; k gill 5 dc and vc feelers ; rm, lateral muscleB; lm, longitudinal muscles, vd, dorsal blood-vessel; bo, ventral blood-vessel; 6m, ventral ganglion; ov, ovary; Ir, opening of nephridium in the perivisceral cavity; np, tubular portion of nepbridium. The circles containing dots represent eggs floating in the pen- visceral fluid. portions of the body wall, arranged so as to offer the greatest possible amount of surface where the capil- laries of the blood system can be almost immediately in contact with, the surrounding water. The nervous system consists of a large supra-ceso- phageal ganglion in the first segment; then of a chain of ganglia, one to each segment, on the ventral side of the body. With one ganglion in each segment there is