ON THE PARTICLES CONTAINED IN THE POLLEN OF PLANTS;

A brief account of microscopical observations made in the months of June, July and August, 1827, on the particles contained in the pollen of plants; and on the general existence of active molecules in organic and inorganic bodies, which can be found in The miscellaneous botanical works of Robert Brown, Volume 1. This manuscript was originally printed as part of a privately circulated pamphlet; hence the editor's note indicating that this manuscript was not published. However, it was reprinted shortly therafter, appearing in the Edinburgh new Philosophical Journal (pp. 358-371, July-September, 1828) and numerous other journals (Mabberley). A subsequent defense by Brown of his original observations, entitled, Additional remarks on active molecules (Brown, 1829) is also included in the text.