DEPRESSIONS FOR ELECTROLYTES—MACGREGOR. 231 
The H,SO, (J—W) curve for high dilutions, being a Jones 
curve, is probably too far to the right, and being plotted with 
Whetham’s coefficients, is probably too high. Wildermann’s 
curve for high dilutions runs parallel to it, considerably to the 
left. The J L B—B curve, for lower dilutions, is very nearly 
coincident with Barnes’ curve, and in its lower part with Jones’s 
and Loomis’s as well. But in the upper part, Jones’ curve goes 
off markedly to the right, and Loomis’s markedly to the left: 
Wildermann’s is slightly to the left at the lower end, and diver- 
ges somewhat leftwards in the upper part. Ponsot’s runs nearly 
parallel to it, somewhat to the left, and diverging to the left at 
higher dilutions. The J L B—B curve is thus trustworthy as to 
form; but being plotted with Barnes’ coefficients, it is probably 
too low. The actual curve would thus appear to cross the 2—3 
(1.85) line not far from its starting point, bend towards the 4—6 
line, and run down below that line, finally bending slightly 
towards it. Its course is therefore what it would be if it started 
as a 2—3 curve, for k=1.85 or thereabout, changed its curvature 
4t a somewhat early stage, and tended to be transformed slowly 
into either a double molecule curve or a 2—2 curve, or perhaps 
both. The diagram would therefore indicate that at extreme 
dilution H,SO, exists in solntion in single molecules, dissociating 
into three ions, that at an early stage and in a somewhat marked 
manner, either doubling of molecules sets in, or partial dissocia- 
tion into two ions, or perhaps both, that the change increases 
slowly and steadily as dilution diminishes, and that at a concen- 
tration of about 0.6, if the coefficients at this concentration are 
to be trusted, the change is iucreasing in rate; also that the 
depression constant may quite readily be about 1.85. 
The K,SO, (L J A—A) curve, is based on series of observa- 
tions which in the main are in good agreement. It very nearly 
coincides with the Loomis and Archibald curves, and Ponsot’s 
runs down slightly to the left. In its lower part it coincides 
with the Jones curve, but in its upper part the Jones curve, 
which is separately represented for great dilutions, runs off to 
the right. Abege’s curve for higher dilutions runs even more 
