As the French-language term vers libre suggests, this technique of using more irregular cadences is often said to have its origin in the practices of 19th-century French poets such as Gustave Kahn and Jules Laforgue, in his Derniers vers of 1890. Taupin, the US-based French poet and critic, concluded that free verse and vers libre are not synonymous, since "the French language tends to give equal weight to each spoken syllable, whereas English syllables vary in quantity according to whether stressed or unstressed."