184 REMARKS ON DR. NYLANDER's PAPER. 



mount to its non-occurrence, and does not, I believe in any way- 

 interfere with the differences I have pointed out as being observ- 

 able in the natural stations of saxicole lichens. 



4°. (Nyl. I.e.) Ibidem in nota attest : " Oxalate of lime consti- 

 tutes 4 . . one of the essential characters of this class of plants." 

 Error est hocce, etc. I must here beg leave to observe that, owing 

 to the curtailing of the passage quoted from my brochure, I am 

 made to endorse the responsibility of an opinion which is not mine, 

 and which I have nowhere expressed as such. The quotation 

 ought to have been given as follows : " constitutes, according to 

 several modern authors, and according to Dr. Nylander, one of the 

 essential characters," etc. My motive for especially mentioning 

 here Dr. N.'s name, arose from a very natural interpretation of 

 the following paragraph of his Synopsis Method. Lick, omn., p. 4. : 

 " Les Lichens possedent en outre, parmi leurs principes immediats, 

 un element caracteristique, facile a reconnaitre, l'oxalate de chaux, 

 dont les cristaux octoedriques se trouvent, a ce que je crois, dans 

 tous les thalles." 



II. — Nouvelle Revue des Lichens du Jardin 



PUBLIC DE BlOSSAC. 



5°. (Nyl. I.e.) Quoad Lichenes liorti publici " Blossac" compa- 

 ratos cum notula mea circa Jwr 'turn " Luxembourg, 1 etc. — Dr. N. 

 here objects to my comparing the Lichen-flora of the public garden 

 of Blossac, in Poitiers, to that of the Luxembourg, in Paris, on 

 the ground that the vegetation of the former of these localities is 

 too analogous to that of the rural tracts bordering upon it. This 

 difference in the relative situation of the two public walks had 

 appeared to me, on the contrary, to be precisely what was suited to 

 give some interest to the comparison of their respective floras, and 

 I may add that it was for the very same reason that I compared 

 the Luxembourg garden, as respects lichens, to that of the more 

 central Tuileries ; these, again, to the London parks ; and, lastly, 

 the side of the garden of Blossac which is hemmed in by dwelling- 

 houses, to that which adjoins the open country. 



6°. (Nyl., p. 62.) Circa reagentia chemica invenimus : "the 

 truth is, an experience of many years permits me to affirm it, that 

 there are some things in the new method that are worth keeping, 

 and others that may be laid- aside." Expeciemus et experientia 

 auctoris discamus, etc. In this part of Dr. Nylander's paper, I am 

 found fault with for not having more precisely stated what I con- 

 sidered to be the defects of the very useful and practical method of 

 diagnosis for which we are indebted to this laborious and acute 

 lichenist. The reason I have to give for the omission, if it be one,* 

 is, however, a very simple one, and I am surprised Dr. N. did not 



# For, while combating, in my brochure, what I think exaggerated criticisms of 

 Dr. N.'s method, I nevertheless clearly acknowledge the existence of " a certain 

 number of dubious results." 



