the Heat extricated Jrom Air by Condensation. 157 



his notions get right about the scale of temperature, and the 

 laws of condensation. 



It will now be seen, that my not looking sooner into the Phil. 

 Mag. for April was a matter of no moment ; and every one will 

 be able to judge whether Mr Ivory has there redeemed his 

 pledge of " clearing away all the clouds of obscurity," of which 

 perhaps he had the best share himself. 



A Tour to the South of France and the Pyrenees., in the year 

 1825. By G. A. Walker Arnott, Esq. M. W. S. (Con- 

 tinued from a former Number). 



JHLaving provided ourselves with all that was necessary for our 

 journey, we left Montpellier in the diligence on the 17th May, in 

 company with our two friends MM. Requien and Audibert, and 

 arrived very late the same evening at Narbonne. On our route, 

 we picked up very few plants, partly owing to our observing scarce- 

 ly any of interest, and partly to the difficulty of getting out of a 

 public coach when we did discover any. About Beziers, we first 

 saw Paronychia hispanica, DC. {Illicebrum argenteum^ Lin.), 

 and Echium violaceum and plantagineum of French authors ; 

 but I have very great doubts if the latter be the true E. plan- 

 tagineum of Linnaeus ; for, if I recollect well. Sir James Smith, 

 in the Flora Graeca, describes the leaves of the E. plantagineum 

 as having strong lateral nerves, and covered with a soft pubes- 

 cence. In the above two French species, however, which I 

 consider as mere varieties of one species, the lateral ribs are by 

 no means conspicuous, and the hairs are always more or les ri- 

 gid. The description given by De CandoUe in the " Flore 

 Fran9aise'' answers well to the plant of Linnaeus ; but it is only 

 indicated at Nice upon the authority of Allioni, who may have 

 confounded it with the E. violaceum *. 



* That which is indicated at Narbonne in the Supplement to the " Flore 

 Fran^aise", is certainly the same with ours. Mr Bentham (Catalogue des 

 Plantes indigenes des Pyrenees et du Bas Languedoc, p. 76.), also considers, 

 what we found as mere varieties of each other, but that each is the true Lin- 

 nean plant : he further observes, that " when the plants grow close together 



