1893.] Presents. 543 



cases; viz., uniformly to the right with bismuth and to the left with 

 had. It is remarkable, however, that this relationship does not hold 

 when aluminium is substituted for zinc, the experiments now in pro- 

 gress indicating that the ties then always slope to the left, whether lead 

 or bismuth be the heavier immiscible metal. 



On comparing together the three sets of critical curves deduced for 

 temperatures not far apart (600 650) with tin, cadmium, and 

 antimony respectively as solvent metal, it is noticeable that whether 

 bismuth or lead be the heavier immiscible metal the curve with 

 cadmium as solvent lies outside, and that with antimony inside, the 

 curve deduced with tin as solvent. The curves obtained with silver 

 as solvent cannot properly be directly compared with these on account 

 of the higher temperatures (800 870) employed ; but, judging from 

 the marked effect of a rise of temperature in depressing the critical 

 curves obtained with cadmium as solvent, it seems probable that for 

 the same temperature the curve with silver as solvent would be found 

 to lie outside of that with cadmium as solvent, the two immiscible 

 metals being the same. At any rate, in all cases the carve with 

 silver as solvent lies far outside that similarly obtained with tin as 

 solvent. 



In the case of alloys containing aluminium as lighter immiscible 

 metal, it has been shown (Part VI) that with silver as solvent the 

 critical curve also lies outside that obtained with tin as solvent, 

 whether bismuth or lead be the heavier immiscible metal. The 

 experiments now in progress seem to indicate that the corresponding 

 curves with antimony as solvent lie again inside the curves deduced 

 with tin as solvent. As already stated, corresponding curves with 

 cadmium as solvent cannot be obtained, as the immiscibility of 

 aluminium and cadmium causes the resulting ternary alloys to belong 

 to an entirely different class, the critical curves pertaining to which 

 cannot be directly compared with those belonging to ternary mixtures 

 analogous to the twelve so far investigated. 



Much of the analytical work requisite for the above experiments 

 was carried out by Mr. Sydney Joyce, to whom the author's acknow- 

 ledgments are due for the assistance rendered. 



Presents, February 2, 1893. 

 Transactions. 



Buda-Pesth : K. Ungarische Geologische Gesellschaft. Foldtani 

 Kozlony. Kotet XXII. Fiizet 510. 8vo. Budapest 1892 ; 

 Mittheilungen. Bd. X. Heft 12. 8vo. Budapest 1892; 

 Katalog der Bibliothek. 1889-91. 8vo. Budapest 1892. 



The Society. 



