= 
Chemistry and Physics. 311 
of zine to that containing 95 per cent of Fund analyses 
were made of the crystals thus edison two. we marked types 
of aiden Sb, and pee two, were obtai ing to the com- 
the oar Heth Av sec ohaly the meets effect of the ex- 
cess of either metal in the alloy. Moreover, the manner in rts 
hae two influences modified tach the other’s action see to 
preclude the supposition that the results could. be the effect of a 
simple mechanical enclosure by the growing crystals. For all 
these details we must refer to the papers cited. We only 
quote a few sentences which. indicate the drift of the writer’s opin- 
time 
“In the absence of any known principle of chemical science by a 
which the re markable variations of composition that have been _ a 
demonstrated in this memoir can be explained, the conclusion is 
ing and apr ee 2 definite crystalline forms in oth 
almost forced [upon us that zinc and antimony are — ble of unit- _ 
than those of their chemical equivalents; in other w a 
2 _ of definite proportions: is not so absolute as has been hitherto fe 
g the view of the witout that has been offered, it 
: wil = eg ara that the very large extent of the variation in the = 
_ compounds of zine and antim ony is due to the =~ weak ae ee 
— these a Sha chemical 
ate Y are, however, a —e 
_ ef facts which tend to prove that it is hed agree = 
es affinity is w wea. Examples beg : 
riations in composition o o< magnit possible — 
ae when the force of chemi ical affinity ne it is ‘highly ate oS 
‘tat some variation e is strong; 
se ae the a ete ht it will 
