An instrument of higher interest, the stereoscope, which, though of much later date (1849-1850), may be mentioned here, since along with the kaleidoscope it did more than anything else to popularize his name, was not, as has often been asserted, the invention of Brewster.
Hyacinth Ronay in his Mutatvdny (Representation) and Jellemisme (Characteristics) endeavoured to popularize psychological studies.
His object was to popularize among his countrymen the astronomical theories of Descartes; and it may well be doubted if that philosopher ever ranked a more ingenious or successful expositor among his disciples.
The committee considered that the Post Office was not prevented either by legal agreement or by good faith from limiting or ending the monopoly of the company, and that competition appeared to be both expedient and necessary in order to extend and popularize the service and to avoid the danger that a purchase of the company's undertaking at an inflated price might be forced upon the government.
But the non-fulfilment of prophecies relating to this or that individual event or people served to popularize the methods of apocalyptic in a very slight degree in comparison with the nonfulfilment of the greatest of all prophecies - the advent of the Messianic kingdom.
The doctrine of the circulation of the blood, which Descartes adopted from Harvey, supplied additional arguments in favour of his mechanical theory, and he probably did much to popularize the discovery.
The Nouvelles de la republique des lettres (see Louis P. Betz, P. Bayle and die Nouvelles de la republique des lettres, Zurich, 1896) was the first thorough-going attempt to popularize literature, and it was eminently successful.
There is no doubt much of valuable suggestion to be found in the philosophic system, or rather the conglomerate of systems, which pass to-day under the name of theosophy; and probably much has been done by means of its propaganda to popularize Eastern thought in the West, and in the East to reawaken a truer appreciation of its own philosophic treasures; but however that may be, the serious student would be well advised to seek his information and his inspiration from the fountain-heads of the theosophists' doctrines, which are all easily accessible in translations; and to avoid the confusions and errors of writers who in most cases have but a superficial if any knowledge of the original languages and systems from which their doctrine has been arbitrarily culled.