Whatever the obligations of the state towards the ecclesiastical society may be in pure theory, in practice they become more precise and stable when they assume the nature of a bilateral convention by which the state engages itself with regard to a third party.
Voluntary enlistments in the French army are permissible, within certain limits, at the age of eighteen, and the engages serve for at least three years.
In its revolution one of its cams engages with the correcting wheel attached to the type-wheel in order to ensure that the latter is in the correct position for printing a complete letter; the second cam lifts the paper against the type-wheel and prints the letter; the third moves forward the paper tape one space to be ready for the printing of the next letter; and the last cam replaces the armature on the cores of the electromagnet.
In rack railways a cog-wheel on the engine engages in a toothed rack which forms part of the permanent way.
Agriculture engages the greater part of the resident population, both male and female; other industries, except the fisheries, are little developed.