importance of inventions now common but once revolutionary, for example, the aeronautic parachute, the reflecting telescope, the spiral corkscrew, the safety pin, the mineral water siphon, the canal lock with winch and sluice, the suction pump.

Were these inventions principally intended for an improved scheme of kindergarten?

Yes, rendering obsolete popguns, elastic airbladders, games of hazard, catapults. They comprised astronomical kaleidoscopes exhibiting the twelve constellations of the zodiac from Aries to Pisces, miniature mechanical orreries, arithmetical gelatine lozenges, geometrical to correspond with zoological biscuits, globemap playing balls, historically costumed dolls.

What also stimulated him in his cogitations?