DUTROCHET, RENÉ JOACHIM HENRI. - OSMOSIS DISCOVERED.

Nouvelles Observations sur l'Endosmose et l'Exosmose, et sur la cause de ce double phénomène.

Paris, Crochard, 1827. Without wrappers. In: Annales de Chimie et de Physique, Par MM. Gay-Lussac et Arago.", Tome 35 (last issue). Halftitle to vol. 35. Pp. 337-400. Dutrochet's paper: pp. 393-400. Some browning to halftitle. Some scattred brownspots.

First appearance of Dutrochet's famous paper in which he coined the terms 'endosmosis' and 'exosmosis', describing the process by which water passes through a membrane from a solution on the one side to another solution on the other side. This pressure, due to the passage of water has been called "osmotic". His conclusion, that the pressure is proportional to the concentration of the solution was confirmed by Karl Vierordt in 1848.

"In 1827, the French physiologist R.J.H. Dutrochet carried out experiments to demonstrate and measure the diffusion of a liquid through a membrane, or 'Osmosis' as it is now called. Dutrochet showed that when a glass tube, filled with salt solution and closed by a piece of pig's bladder, is immersed vertically in water, water passes through the membrane into the tube until the level of liquid in the tube is considerably higher than teh level of the water outside."(Taton "Science in the 19th century", p.256)

Garrison & Morton No 670. - Gedeon: 63.2 (ref. to a paper from 1828).

Order-nr.: 43596