864 



Elatine alsinastrum, E. hexandra and Scirpus supinus, but I suc- 

 ceeded only with the first. The Etang du trou Sale is a pool made 

 by damming up a trifling valley, and the permanent supply of water 

 is very small, if any, yet a number of persons engaged in angling may 

 serve as a proof that it is never quite dry. The sides are very nearly 

 level, so that a fall of a few inches exposes a great extent of land 

 overflowed in the winter. In this part grows the Potentilla, this year 

 in great abundance, but in some years it is said to be very sparingly 

 scattered. Here also is Gypsophila muralis, and an Alopecurus that 

 is called fulvus, but which I think does not differ from A. bulbosus. 

 Some of the plants have a decided swelling at the base of the stalk, 

 others are as decidedly without it, and between these there is every 

 possible step. A little higher up we find Ly thrum hyssopifolium, and 

 on the edge of the water, Littorella lacustris, Limosella aquatica and 

 Scirpus acicularis. For Scirpus supinus I am probably too early, as 

 I believe it hardly flowers before September. 



On the 14th I again accompanied M. de Jussieu and his pupils : 

 M. Delile and his son, and M. Maire, were also of the party. We 

 went on the rail-road to Athys, where we crossed the water, traversed 

 a cultivated plain, and afterwards followed a little stream to its source 

 in the forest of Senart. There is a good deal of boggy ground in this 

 forest, where the face of the country seems to give little expectation 

 of such a feature. Our plants were Exacum CandoUii and filiforme, 

 Juncus tenageya, Centunculus minimus and Potamogeton heterophyl- 

 lus, all near the Carrefour des Cerfs. Epipactis palustris and Chlora 

 perfoliata, abundant on the boggy ground. Utricularia minor, Inula 

 salicina, Campanula cervicaria, Malva Alcea, Peucedanum parisiense, 

 Selinum caruifolium, Stachys germanica, Polycnemum arvense, Stel- 

 lera passerina, and Carex intermedia, the latter growing in the water, 

 'and putting on an appearance different from that which it has with us. 



We concluded our walk at Ris, where we again got on to a rail- 

 road train, and reached Paris about 6 o'clock. 



On looking back at the course I have held, I must acknowledge 

 that my turning south at Mantes before reaching Paris was not well 

 planned in point of Botany, though a view of the cathedral at Char- 

 tres might be well worth such a deviation. A better way would be to 

 stop at Vernon. There is a little valley above Vernon where perhaps 

 something might be found, but the acknowledged spot of good Bota- 

 ny in on the hill of St. Catherine, on the opposite side of the Seine. 

 From Vernon, descend in the steam-packet to the lesser Andelys, 

 where the Rochers de St. Jacques on one side of the town, and Cha- 



