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(3) Sillimans A. Journal

Vol. 46 p. 94. Catalogue of Plants in Illinois & Missouri - In comparing N. American & European plants we find (1) "nearly allied geographical species" (2) Geographical Varieties, "where no specific distinction can be discovered, but where the American & European variety can always be distinguished by some points of minor importance." (3) Identical plants p. 95. Erigeron Canadense & Oenothera biennis are now as widely naturalised in Europe, as Taraxicum Dens-leonis in America.

p. 99. In list 4 hybrids of Robinia are enumerated - Generally both parents grow near hybrid -they are sterile, but grow luxuriantly & are local - Some of the hybrids resemble more one parent than other, & some intermediate

The doubtful hybrids produce more seed than the true

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(4) intermediate hybrids, though far less than the true species - The doubtful hybrids perhaps descended from hybrids impregnated by either parent.

p. 101. Rumex obtusifolia & crispus (both introduced plants) have also produced hybrids

[George Engelmann. 1844. Catalogues of a collection of plants made in Illinois and Missouri, by Charles A. Geyer; with critical remarks, &c. American journal of science and arts, 46: 94-104.]

The Association of American Geologists in 1844 Prof. Haldeman has paper "Enumeration of the Recent F. W. Mollusca Important Remarks of Lyell v. Lamarck controverted.

[Samuel Steman Haldeman. 1844. Enumeration of the recent freshwater Mollusca which are common to North America and Europe; with Observations on Species and their Distribution. Journal of Natural History (Boston), 4: 468-484.]

[See letters between Darwin and Charles Lyell in Correspondence vol. 7, pp. 306-308.]

New Series

Vol I. p. 450. On the Death & disappearance of some trees & shrubs in Georgia by W. Jones. Four trees mentioned. Mem. Van Diemen's Land.

[W. Jones. 1846. On the death and disappearance of some trees and shrubs. American journal of science and arts, series 2, 1: 450-451.]

vol 2. p. 304. Archiv für Naturgeschichte no 1. 1846 on geograph Zoolog. of Indian Archipelago. Dr. S. Müller

[Bibliography: Sal. Müller. 1846. On the geographical zoology of the islands of the Indian Archipelago. American journal of science and arts, series 2, 2: 304.]