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livres. You will also be so kind as to procure for 
me on your return to Paris, such other Fungi as 
Bulliard may have published since you bought them, 
together with the Mistozre des Champignons, and 
such other letter-press as may relate to that subject. . 
Your thesis I shall hope to receive on your re- 
turn. Retzius is, I take it, a Swedish professor, who 
has published three fasciculi of observations in bo- 
tany, in 1779, 1781, and 1783. The second is de- 
dicated to Sir Joseph Banks. There are a few 
plates, particularly the real Astragalus arenarius, 
and another called Hippuris lanceolata, which I 
apprehend to be the ¢etraphylla ; some good ob- 
servations, and I apprehend some error. I think I 
saw the book in your library. I thank you for 
Gnaphalium luteo-album, and Agrostis minima, both 
of which are treasures. 
I need not say how often I have wished myself 
with you, for it has happened every step you record 
of your tour, and every library and herbarium you 
have examined. The names of the old botanists 
seem to carry one into enchanted ground; and the 
travelling through the herbaria of Tournefort and 
Vaillant, &c. is like taking a journey to Jupiter or 
Saturn, to verify the number of their satellites, and 
periods of their revolutions. 
Your Senecio acanthifolius must be a magnifi- 
cent plant, and the rest I long much to see. Ifyou 
return through Switzerland as you propose, pos- 
sibly you may have an opportunity of inspecting 
Haller’s herbarium, which would, I should think, 
be of great adyantageto an accurate Flora Anglia, 
