892 
EEV.  T.  P.  DALE  AND  DE.  J.  H.  GLADSTONE  ON  THE  INELrENCE 
Tempera- 
ture. 
Refractive 
index  of  A. 
Refractive 
index  of  D. 
Refractive 
index  of  H. 
Sensitiveness 
per  5°  (A). 
Length  of 
spectrum. 
Dispersive 
power. 
0°  c. 
5 
10 
30 
40 
50 
1-3378 
1-3361 
1-3343 
1-3292 
1-3247 
1-3187 
1-3379 
1-3297 
1-3519 
1-3500 
1-3483 
1-3432 
1-3387 
1-3331 
0-0017 
0-0018 
0-0013 
0-0022 
0-0030 
0-0141 
0-0139 
0-0140 
0-0140 
0-0140 
0-0144 
0-0414 
0-0424 
This  Table,  though  imperfect,  suffices  to  show  the  close  analogy  in  every  respect 
between  methylic  and  ethylic  alcohol. 
Amylic  Alcohol  and  Caprylic  Alcohol. — These  two  alcohols,  the  specimen  of  the  first 
boiling  at  130°  to  132°  C.,  that  of  the  second  at  about  181°  C.,  yielded  results  verv' 
comparable  with  those  of  the  alcohols  previously  examined,  though  they  are  more 
refractive  than  their  congeners  lower  in  the  series.  Indeed,  it  seems  probable  that  an 
advance  in  refractive  power  occurs  with  each  increment  of  C2  Ha.  A similar  advance  in 
the  length  of  the  spectrum  is  also  perceptible,  but  not  in  the  sensitiveness.  The  follow- 
ing Table  will  sufficiently  exhibit  this : — 
Alcoho]. 
Tempera- 
Refractive 
Refractive 
Sensitiveness 
Length  of 
ture. 
index  of  A. 
index  of  H. 
per  10°. 
spectrum. 
Methylic : — 
o°c. 
1-3378 
1-3519 
0-0035 
0-0141 
C2  H4  O2 
10 
1-3343 
1-3483 
0-0140 
Ethylic : — 
C4  Hg  Og 
0 
10 
1-3658 
1-3617 
1-3811 
1-3769 
0-0041 
0-0153 
0-0152 
Amylic : — 
^10  ^2 
0 
10 
1-4084 
1-4060 
1-4263 
1-4238 
0-0024 
0-0179 
0-0178 
Caprylic : — 
0 
1-4291 
1-4504 
0-0039 
0-0213 
HjgOa 
10 
1-4252 
1-4454 
0-0202 
Hydrate  of  Phenyl. — A specimen  of  this  substance,  the  principal  constituent  of  cre- 
asote,  boiling  at  187°  C.,  was  examined.  It  was  solid  at  the  ordinary  tempera  time,  but 
on  cooling  gradually  in  the  prism,  it  remained  liquid  even  at  12°-5  C.  The  addition  of 
a little  solid  hydrate  caused  the  whole  then  to  fly  into  crystals  until  the  evolution  of 
sensible  heat.  As  this  body  has  also  a great  attraction  for  water,  the  experiment  was 
performed  on  a very  cold  dry  day. 
Tempera- 
ture. 
Refractive 
index  of  A. 
Refractive 
index  of  D. 
Refractive 
index  of  H, 
Sensitiveness 
per  5°  (D). 
Length  of 
spectrum. 
Dispersive 
power. 
13°  C. 
25 
30 
35 
40 
45 
50 
60 
65 
70 
1-5377 
1-5321 
1-5301 
1-5276 
1-5254 
■ 1-5230 
1-5205 
1-5156 
1-5132 
1-5109 
1-5488 
1-5429 
1-5413 
1-5386 
1-5362 
1-5337 
1-5311 
1-5262 
1-5238 
1-5209 
1-5886 
1-5823 
1-5802 
1-5773 
1-5748 
1-5717 
1-5692 
1-5637 
1-5616 
1-5587 
0-0025 
0-0016 
0-0027 
0-0024 
0-0025 
0-0026 
0-0024 
0-0024 
0-0029 
0-0509 
0-0502 
0-0501 
0-0498 
0-0494 
0-0487 
0-0487 
0-0481 
0-0484 
0-0476 
0-0927 
0-0925 
0-0921 
0-0916 
0-0914 
0-0913 
