LETTER OF TRANSMITTAL.
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SIR : I have the honor to transmit to you the third and last part of the Coal Flora of Pennsylvania and the United States, by Mr. Leo Lesquereux, with additions and corrections of the first and second volumes (published in 1880); a table of species referred to localities; a table of species referred to formations; and a revised index of generic and specific names, referred both to pages and to plates, for all three volumes.
Four years have passed since the publication of the 87 plates of fossil plants in the Atlas to the Coal Flora. During these years, and partly as a consequence of that publication, large quantities of new material have been sent, from all quarters of the United States to the distinguished botanist for investigation. So many new and remarkable forms were discovered in these shipments that he has been able to select enough to fill 26 additional plates with which to illustrate his new species, not only of leaves but flowers and fruits, some of which are singularly beautiful and surprising.
I remain, sir, yours respectfully,
J. P. LESLEY. PHILADELPHIA, June 18, 1884.