Correspondence, by Benedict de Spinoza, , at sacred-texts.com
XLIV. [Remarks on Descartes treatise on Optics.]
XLV. [Remarks on some alchemistic experiments, on the third and fourth meditations of Descartes, and on Optics.]
XLVI. [Remarks on Hydrostatics.]
362:2 I. I. Probably Jarig Jellis, a merchant of Amsterdam and a Mennonite. He translated the Opera Posthuma into Dutch, 1677.