122 
PHYSICS: C. BARUS 
Proc. N. a. S. 
therefore here seem to be a mistake to associate wave-length with crests 
and troughs in these diagrams, however plausibly such inferences may 
obtrude. It is very much more probable that in the south some extra- 
neous 5-distribution has been superposed. 
%^-50 -40 -2>0 -m 0 40 20 2>0 40 50 
The West-Bast distributions y) though not so sharp in their fea- 
tures in figures 6, 7 and 8, show an equally pronounced character when 
treated in the same way relative to vertical variations, in figure 10. 
Each of the triplet graphs is to be referred to an origin at the marked 
on the curve and the 5-intervals are 20 scale-parts, as heretofore. Since 
the edges of the table are at y == =^60 cm. (nearly ) , the nodal plane does 
not extend quite so far ; but it does not follow that these edges have much 
influence on the results, since the same kind of graphs appear in figure 9, 
where the edges of the table are nearly 50 cm. further. The degradation 
of the nodal plane occurs first at y = 50 cm. in the east as it did in the 
north. 
In the west it is still strong at y = — 40, and now promises to run 
through another cycle of intensity as in the previous case. The antinode 
very nearly 5 = 0 throughout the east, begins to lose identity between 
y = — 20 and — 30, to be followed by oscillations. Finally, the first 
nodal plane above the table degenerates here more obviously than before, 
between y = — 30 and — 40. 
