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marshes by a path to the right, which is not always practicable. I 

 was told that this would take me to St. Val: I do not know whether I 

 made some mistake, and kept too much to the left, but I came out at 

 Boigneville, the hills behind which descend in a sort of double slope, 

 of which the highest is stony and the lower sandy. Behind the last 

 houses of the village, on the upper part of the lower slope, Hyssopus 

 officinalis grows in great profusion. At Boigneville are two respect- 

 able public-houses. I continued my walk to St. Val, behind which 

 there is a range of rocky wood, where however I added nothing, and 

 I should recommend it and some points above to the examination of 

 another day, when the botanist has not spent his time and his labour 

 in hunting out plants by the way: he will therefore set his face home- 

 wards, and passing the little bridge at Boigneville, ascend the rock 

 of St. Gervais by a winding foot-path. This bridge is over a little 

 stream, whose sources are in the marshy ground of the valley above, 

 and there are moist places at the foot of the rocky bank a little above 

 the level of the marsh, which seemed promising, but I found nothing. 

 As he emerges from the rocky ascent of St. Gervais, he will find Bu- 

 pleurum aristatum, which I believe is the only addition 1 have made 

 to the Flora of Paris : and he will enjoy a fine view up the rocky val- 

 ley of Prainvault, and down that of the Essonne. Thence keeping to 

 the left on the edge of the hill, he will come to a carriage-road which 

 rises from the valley. Near this he ought to find Ruta graveolens 

 and Allium carinatum, but I failed in both, although 1 returned a se- 

 cond time to look for them. After leaving this point I took the by- 

 road to Argerville, and turning to the right followed for some distance 

 the valley of the Essonne to Touvault, soon after which my road as- 

 cended the hills. I left it at the top and followed the crest, which 

 gave me again Limodorum abortivum and Bupleurum aristatum. 

 From this point we may pass through a little hamlet, and above the 

 chateau of Rouville, and gather Rosa lutea and Limodorum aborti- 

 vum, if we have not already included them in our collections. 



Many other excursions, extending to a greater distance, might 

 doubtless be made profitably from Malesherbes, keeping among the 

 woods and steep banks which border the valley of the Essonne ; for 

 on the flat table-land which extends on each side, there is little to be 

 found. I went on one occasion to Boissy aux Cailles, near which, 

 in the early spring, M. Barnard obtained Scilla bifolia and Corydalis 

 fabacea. I found nothing; but it is curious and very delightful, after 

 a long, dull, nearly level walk, to find one's self on the edge of a dee]) 

 picturesque hollow, where rocks, woods and sandy banks are mixed 



