Baruch Spinoza's collected works, volume 1. Written in Latin, which was the common language for scientific and philosophical studies at the time. Content:

1. Tractatus de Intellectus Emendatione
2. Ethica - ordine geometrico demonstrata
3. Tractatus Politicus
4. Tractatus Theologico-Politicus
5. Annotationes in Tractatum Theologico-Politicum post librum editum adscriptae