6. Broom-corn (_Sorghum saccharatum_) and lavender (_Lavendula spica_) in flower. 7. Early jenneting apples ripe. _Ambrosia trifida_ and American senna (_Cassia marylandica_) in flower. 11. Muskmelon ripe. Garden squashes and shelled beans fit for the table. 13. Seed-box (_Ludwigia alternifolia_) in flower. Garden gooseberries fully ripe. 14. Our farmers gathering their peas and oats--an indifferent crop. Weather warm and dry. 16. Martins departing. Bush clover (_Lespedeza capitata_) in flower. 18. Our farmers beginning to mow their second crop of hay. Jerusalem oak (_Chenopodium botrys_) in flower. 20. Houseleek (_Sempervivum tectorum_) in flower. 21. Herb clarry (_Salvia sclarea_) in blossom. 22. Swallows collecting in thousands to depart. Toothed coral (_Cymbidium odontorhizom_) in flower. Saw bats for the first time this year. 24. Lopseed (_Phryma leptostachia_) and ladies' traces (_Neottia pubescens_) in flower. 27. Gay mallows (_Lavatera thuringiaca_) and _Solanum nigra_ in full flower. 30. Burnet saxifrage (_Sanguisorba canadensis_) and water horehound (_Lycopus europæus_) in full flower. STEPHEN W. WILLIAMS. _Deerfield, (Mass.) Jan. 25, 1819._ ART. VIII. _Description and Natural Classification of the Genus Floerkea, by_ C. S. RAFINESQUE. This genus was discovered in Pennsylvania, near Lancaster, by the Rev. Dr. Muhlenberg, who communicated the same to Wildenow of Berlin. This celebrated botanist ascertained that it was a new genus, to which he gave the name of a German botanist, (Floerke) and published it in the third volume of the transactions of the society _des Curieux de la Nature_ of Berlin, for 1801, under the name of _Floerkea proserpinacoides_, which long and uncouth specific name has been changed by every subsequent author. Michaux has omitted it altogether, (with many more American species) in his _Flora Boreali Americana_, published in 1803. Persoon calls it _Floerkea lacustris_, in Syn. plant. 1. p. 393. Muhlenberg _Floerkea uliginosa_, in Cat. pl. Amer. Sept. p. 36. and Pursh, in Flora Amer. Sept. 1. p. 239, unites it with the genus _Nectris_, and calls it _Nectris pinnata_, putting it therefore in the Hexandria digynia of Linnæus, while all the preceding authors had classed it in the Hexandria monogynia. I will show presently which among them appear to be wrong; but I must notice before, that no botanist had, I believe, endeavoured to class it naturally, until Mr. Correa de Serra, who in his _reduction of American genera to the natural families of Jussieu_, attempted, without having had an opportunity to see the plant, to place it in the family of _Junci_, taking it therefore to be a monocotyle plant; being led into this error by a mistaken idea, that all hexandrous plants must be monocotyle! But in the spring of 1816, I found this plant in the neighbourhood of Philadelphia, (near the falls of the Schuylkill)