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Now, if the point a 2 does not lie very near the straight line joining the origin to al5 then the right-hand side of (9) will vanish for all R ; for f { f Q ( R ) vanishes except in the neighbourhood of this line, as we have shown, and V oj, (R -a2) vanishes except in the neighbourhood of a2. Therefore in this case, it follows, as before, that the only solution of (9) satisfying our initial conditions is i f k and there is therefore no probability of both atoms being excited. If, on the other hand, the line joining ax, a2 does pass through the origin, then we can obtain as before a solution representing a wave diverging from the point a2.The amplitude of this wave gives the probability that both atoms are excited, and th at the particle is moving in a given direction after exciting both.In conclusion, the author would like to express his thanks to Prof. Darwin, who has contributed a great deal to the course of the development of this paper. A comparison-of the electrical conductivities of aqueous solutions of salts and acids reveals a striking contrast between these two classes of substances as regards their electrolytic dissociation. In water almost all salts are largely dissociated into ions and, when no complications are introduced by hydrolysis, the conductivities of dilute salt solutions show remarkably good agreement with the theory of Debye and Huekel as modified by Onsager.* Acids, on the other hand, show a wide variation in their degree of dissociation and very few behave as strong electrolytes. This difference in behaviour between salts and acids is usually explained by the properties of the proton, which, unlike other cations, has no screen of electrons round the nucleus, and therefore is assumed to be incapable of existing uncombined in solution, t here is much evidence direct and indirect in support of this view, and it seems probable that D. M. Murray-Rust and

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Tetraethylammomum a Ammonium Salts.427 the occurrence of a very rapid rise to a m axim um rotation, followed by a slow fall to a steady value.(2) The form of the m u taro tatio n curves in carbon tetrachloride and in alcohol can be expressed, as in th e case of a and (3 galactose, by th e algebraic sum of two exponential term s of opposite sign[a], = Ae~W l< + + C.(3) This equation also serves to express th e form of the m u tarotation curves for solutions in carbon tetrachloride when catalysed by pyridine, b u t no t by alcohol. I t is therefore suggested th a t alcohol m ay form a complex w ith th e alum inium -com pound, as well as w ith th e corresponding beryllium -com pound.

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