. Journal of anatomy. shorter ducts than with those which extend morecranially. This is especially the case on the right side; and a similarcondition, present in cases of double ureter recorded by A. T. Kerr {TheAnatomical Record, Feb. 1911, p. 55), is regarded as a reason why the viewexpressed by Huntington should not apply to such cases. But doubtlessit might to Huntingtons case. In this connection, see also Keibel andMalls Embryology, vol. ii. pp. 867-8. On each side (see fig. 1) the arteries (and veins) which passed throughthe hilura and came into relation with the shorter duct crossed fir
. Journal of anatomy. shorter ducts than with those which extend morecranially. This is especially the case on the right side; and a similarcondition, present in cases of double ureter recorded by A. T. Kerr {TheAnatomical Record, Feb. 1911, p. 55), is regarded as a reason why the viewexpressed by Huntington should not apply to such cases. But doubtlessit might to Huntingtons case. In this connection, see also Keibel andMalls Embryology, vol. ii. pp. 867-8. On each side (see fig. 1) the arteries (and veins) which passed throughthe hilura and came into relation with the shorter duct crossed first in front Bilateral Duplication of the Ureter 33 of the longer duct, and then passed one in front and the other behind theshorter duct. The arteries (and veins), in relation to the longer ducts alone,lay in front of the duct on the right side, where tlua-e was oidy a relativelysmall twig representing a retro-pelvic artery, and on the left side passedone in front and another, e(iually large, behind the duct (fig. 1).. Fk;. 2. — Microphotogiajih. The two lumina ;iic sin. T lie dark areas aremuscle-bundles. Only a relatively small pari uf iIr^ tunica adventitia isshown at the top of the photograph. The left kidney was distinctly larger than the riglit; and it will be seenthat there was a considerable difference on the two sides, both in the numberof calyces and in the size of the ducts. Lateral to the anterior margin of thehilum the ducts of the right kidney were distinctly expanded (fig. 1). Thisobvious expansion was not present on the left side. These points are Ralph Thompson {Journ. Anat. and Phys., vol. xlviii.,April 1914) states his belief that in certain conditions, owing to differencesin anatomical relations, blood, at any rate, escapes with greater difficultyVOL. LI. (third SER. VOL. XII.)—OCT. 1916. 3 34 Mr Douglas G. Reid from the right kidney than from the left, and that therefore the flow ofurine along the right ureter may be retarded also. The
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