Memoirs presented to the Cambridge philosophical society on the occasion of the jubilee of Sir George Gabriel Stokes, bart., Hon. LL. D., Hon. SC. D., Lucasian professor.

<embridge P/ailoesep/ie Treïsactiens, VolN JJIL, P/etI 10L
PLATE 10.
Absorptions by sol iutio.is of erlilmn chlride and eq ui valenrt solutions of erbtium nitrate, alternately:
fut1r degrees of concentration, the strongest having 726'6 grains of t he anh.yrons chloride to the litre,
tind the ec-quivalent nitrate 935'2 grarms to the litre.
iQ D C C. ' '- G
_0 S"t 00 Y' } ï 0 0 L ~
r~1~...no ~,,-~.~~~ - =,~;1st crongest solution of Er C1o,iii: i:i..2~r~~~~~~~~~~~.ii~ ~38mnfl t thick
st roniest solution of
Eî (N0 '>):
38 mi-n. thick
hal tst'ength ch]oruide
176 int. tbick;f:s~ ( ), C, z ia~~~lftll- 6t;e~~l ength nitrate
' ~ ~~~4 ti-1~~ ' ' ' '~. m...7i.. tilick
(.aiirter-sti'eogth chloride
I! ~~>554;4!2":i15?'305 min. thickly
one-eighth-sti-c ng-th nitrate
305 mmn. m thick
Thec greater diffuselness of thie bLnds wiih the more concent'ted solutions of theli nitrate is evident,
a1id so is t'ihe extension of the gn\enal a bsorption t tbe niore refrcngYle eîd uf tu.he spectrulli with -t-e
ouist eoncent'-ra'te solution of the C'lhloîide,
The difference between n the absorptions by thie chloride and nitrate din-inishes -ifth. dilution and lias
almost, or qitte, disae, ipea lred in. the case of thie w,kest solutions.