The specialization which accompanies the division of labour has important geographical consequences, for it necessitates communi 1 On the influence of land on people see Shaler, Nature and Man in America (New York and London, 1892); and Ellen C. Semple's American History and its Geographic Conditions (Boston, 3903).
Two years later Nitzsch, who was indefatigable in his endeavour to discover the natural families of birds and had been pursuing a series of researches into their vascular system, published the result, at Halle in Saxony, in his Observationes de avium arteria carotide communi, in which is included a classification drawn up in accordance with the variation of structure which that important vessel presented in the several groups that he had opportunities of examining.
And in January 1902, reversing the policy which had its inception in the encyclical, Rerum novarum, of 1891, and had further been developed ten years later in a letter to the Italian bishops entitled Graves de communi, the "Sacred Congregation of Extraordinary Ecclesiastical Affairs" issued instructions concerning "Christian Democracy in Italy," directing that the popular Christian movement, which embraced in its programme a number of social reforms, such as factory laws for children, old-age pensions, a minimum wage in agricultural industries, an eight-hours' day, the revival of trade gilds, and the encouragement of Sunday rest, should divert its attention from all such things as savoured of novelty and devote its energies to the restoration of the temporal power.
Thus, when the circulation to an external part is obstructed completely, as in the case of a limb where the main artery has been occluded and where the anastomatic communi cations have not sufficed to continue the supply of blood, the part becomes gangrenous (fig.
His heliometer (described in a paper communi cated to the Royal Society in 1743, and FIG.
Rotation is communi cated by a pinion, turned by the handle c (concealed in the figure), which works in teeth cut on the edge of the flange h.
Pulleys and drums for communi cating a constant velocity ratio are circular.
The its muscular coat; g, g, the heart is of the usual Arthro lateral teeth, which when podous type, lying in a more or in use are brought in conless well-defined pericardial blood tact with the sides of the sinus, with which it communi median tooth m; c, c, the cates by valvular openings or muscular coat.