The slower propagation of light in gas or water than in air or vacuum may be attributed to a greater density, or to a less rigidity, in the former case; or we may adopt the more complicated supposition that both these quantities vary, subject only to the condition which restricts the ratio of velocities to equality with the known refractive index.
The velocity of propagation of temperature waves will be the same under similar conditions in two substances which possess the same diffusivity, although they may differ in conductivity.
This can be measured graphically without any knowledge of the law of variation of the surface temperature, or of the laws of propagation of heat waves.
The Central African Mission (1858), indeed, is not for the most part manned by graduates, though it is led by them; but the Cambridge Mission at Delhi (1878), the Oxford Mission at Calcutta (1880), and the Dublin Missions in Chota Nagpur (Society for the Propagation of the Gospel, 1891) and the Fuh-Kien Province of China (Church Missionary Society, 1887) consist of university men.
It is one thing to protect individuals from mosquito bites, another to prevent the propagation of the parasite in a whole community.
From the time of Plato medicine has been accused of ministering to the survival of unfit persons, and to their propagation of children.
But Mill and the others were fully justified in not aiding the propagation of a doctrine in which they might not wholly concur.
She wrote Institutions dehysique (1740), Dissertation sur la nature et la propagation du feu (1 744), Doutes sur les religions reculees (1792), and in 1756 published a translation of Newton's Principia.
The Baptist Society celebrated its centenary in 1892; the London Missionary Society (Congregational) did the same in 1895; the Society for Promoting Christian Knowledge kept its bicentenary in 1898; the Church Missionary Society its centenary in 1899; the Society for the Propagation of the Gospel its bicentenary in 1900-1901; and the British and Foreign Bible Society its centenary in 1904.
That impression, however, is not correct, for in reality the demonstrations of these longer Meccan suras appear to have been peculiarly influential for the propagation of Islam.