and tin-stone in other places, probably formed bj fumaroles, 

 ■which accompanied the eruption of the granites." 



Professor A. Lacroix, in his " Memoire sur l'axinite des 

 Pyrenees, ses formes et les conditions de son gisement, 1892," 

 alludes to limurite as follows : — " This latter variety of 

 axinite is associated with calcite, quartz, pyroxene, and green 

 hornblende. It consists occasionally of small veins several 

 decimetres wide, and at some spots forms a compact very 

 tough rock, found as stones in the bed of the Adour, and 

 described by Zirkel under the name of limurite. This rock, 

 the geological relations of which were hitherto unknown, 

 does not belong to a definite petrographical type. It varies 

 in structure and mineralogical composition in the different 

 parts of the same bed." 



Professor Lacroix considers it probable that the formation 

 of axinite in the Pyrenees has proceeded under the influence 

 of boric acid emanations acting on the walls of the sedimen- 

 tary rocks which they traverse. He has established the con- 

 stant appearance of axinite at the contact of granite with the 

 palsezoic rocks, and concludes that it owes its origin to 

 granitic fumaroles following the intrusion of the eruptive 

 rock. 



M. Daubree has cited axinite as produced in a palaeozoic 

 limestone of the Vosges at its contact with a hornblende or 

 mica porphyrite (Comptes rendus t. XVIII., p. 870, 1844). 



In Cornwall axinite, garnet, brown mica, and tourmaline 

 are minerals of the contact zone in foliated diabases and basic 

 hornblende slates, the latter possibly altered lavas, when 

 tourmaline-bearing granites have acted upon them. 



Mr. J. Collett Moulden, A.R.S.M., Lond., is the author of 

 " Petrological observations upon some South Australian 

 rocks " (Trans. Roy. Soc, S. Aust., 1895, Vol. XIX.), in 

 which he has described an axinite amphibolite from JKosetta 

 Head. He says the rock consists mainly of hornblende with 

 a colourless augite, and axinite as a rock-forming constituent 

 in considerable quantity. Accessories are biotite, quartz, 

 and chlorite. 



Eosenbusch states (Microscopical Physiography, Rosen- 

 busch-Iddings, 1895, p. 344), "Axinite occasionally occurs 

 on the borders of diabases and granites, and among their 

 contact products." 



It is thus fairly well established by high authorities that 

 the axinite rock occurring in the Pyrenees and at North East 

 Dundas is of remarkable petrological interest as a rare 

 example of an igneous contact occasioned by acidic plutonic 

 action causing emanations of boracic acid with other matter 

 in the form of fumaroles. Notwithstanding the known occur- 



