372 
Mr. M. Ponton on certain Laws 
Taster III.—Internal Wave-lengths, freed from the extrusions, 
calculated by formula = —a=uU. 
Media in same order as in Table I. 
seeeeneee 
Nitrate of bismuth 
Water, No. 1, T.18°°75.. 
Water, No. 2, T.18°75.. 
Water, T. 15°°8 
Muriate of zinc 
Subacetate of lead ...... 
Nitrate of mercury ...... 
Sulphate of soda 
Muriate of baryta ...... 
Superacetate of lead 
Nitrate of potash ...... 
Sulphate of magnesia... 
Nitrate of lead ......... 
Muriate of ammonia 
Alcohol 
Pyroligneous acid ...... 
Nitric acid ..... sossntne sc 
Muriate of lime ... 
Muriatic acid 
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B. 
I"000000 
b2. 
Cc. 
0953893 
CQ. 
0°716500 
0°7 16336 
0°716328 
0°715924 
O°712751 
0°751596 
0°7 51429 
0°751418 
0751003 
0°747799 
0°74.9 19 1/0°7 14208 
0°74.5882|0°7 10990 
0°74.6836/0°711947 
0°74.6558]0°711693 
.»-|0°74.4.78 5|0°709982 
0°74.3206]0°7084.32 
0°74.4439|0°709667 
0°743388|0°708634 
.J0°740901|0°706251 
0°733931|0°699660 
0°728355|0°694298 
3°71516c]0°6815 32 
. |0°714.145|0°680660 
0°71185510°678393 
Sol. of potash, T. 21°°5..|0°714609|0°681154 
Solution of soda ......... 0°712635|0°679206 
Sol. of potash, T. 16°..../0°713090|0°679681 
Sulphuric acid............ 0°698311/0°665686 
Oil of turpentine......... 0°680315|0°6483 14 
Calc-spar ex. ray......... 0°674.053]0°642600 
Oil of cassia,T. 22°°5 ...10°630954/0°599579 
Oil of sassafras ......... 0°656067|0°624.755 
Oil of anise, T. 20°°9 ...]0°648146|0°616855 
Oil of cassia, T. 14° ...}0°629046!0°597793 
Oil of anise, T. 15°°1 ...)0°646626|0°615421 
Oil of cassia, T. 10° ...}0°627986]0"°596785 
Oil of anise, T. 13°'25.,.|0°646786|0°615601 
GreQBOLe vancaasstecasee cae 0°653379|0°622201 
Crown-glass No. 13. ...|0°656212|0°625439 
Crown-glass No. 9 ...... 0°655557|0°624807 
Rock-salt ...........s0eee 0°649577|0°618914 
Arragonite, 1st axis ...|0'654801/0°524236 
Quartz O. ray .......0.00. 0°64.9086!0°618727 
Bisulphide of carbon ...}0°618904)0°588581 
Crown-glass M ......... 0°6434.1210°613147 
Quartz €X. YAY... eee eeeee 0°64.5321|0°615128 
Flint-glass No. 3......... 0°624577|0°594916 
Flint-glass No. 30 ...... 0°6.16346]0°586998 
Flint-glass No. 23 (2) ....0°615222)0°585916 
Flint-glass No. 23 (1) ...Jo"615218|0°585913 
Flint-glass No. 13 ...... 0°61474.9]0°585460 
Topaz, 2nd axis ......... 0°62184110°592779 
Topaz, 3rd axis ......... 0'621021/0°592000 
Topaz, 1st axis ......... 0°618195|0°589302 
Cale-spar O. ray .........|0°605154|0°5 76602 
Arragonite, 3rd axis ... 
Arragonite, 2nd axis ... 
0°596736)0°568621 
0°59524.1/0°567182 
D. 
0°856059 
‘ dy. 
0°642029 
0°641873 
0°641870 
0°64.1487 
0°638380 
0°639977 
0°636951 
0°637912 
0°637713 
0°636131 
0°634.644 
0°635882 
0°634887 
0°632721 
0°626940 
0°62.2030 
0610175 
0°609608 
0°607389 
0°6 10164 
0°608271 
0°608790 
0°596457 
0°580409 
0°575860 
0°533004 
0°5 58314 
0° 550457 
0°531476 
0°549204 
Ons O5 79) 
0°549429 
0°5 56044 
o*560140 
9°559557 
0°553851 
0°559379 
0°554307 
0°524238 
0°548927 
0°551060 
0°531979 
0°5 24.724 
0°523730 
0°523729 
|0°523310 
0°531114 
O15304-19 
0°527993 
0°516017 
0°508961 
0507643 
E. 
0°764567 
2. 
KS 
0°704.210 
So 
0° 526443 
0°526299 
0°526304 
0°525955 
0°522950 
0°52.4764 
0°522036 
0°§23003 
0°522890 
0°521508 
O°520119 
0°521361 
07520426 
0°563960/0°518599 
0°558934|0°514071 
0°554.448|0° 509865 
0°54344510°49423 
0°54.316210°499328 
0°540988)0"497184 
0°543776|0'499981 
0°54.1935|0°498174 
0°542.494|0'498760 
0°531716/0°489007 
0°5§16907|0°475015 
0°513447/0°472273 
9°470745|0°429673 
0°4.96180|0°455190 
0°488363/0°447401 
0°4694.59|0°428 546 
0°487281/0'446431 
0°4.638666/0°427822 
0°48754.7/0°446724 
0°4.94176/0'4 53362 
0°4.99075/0°458791 
0°4.98537|\0°458283 
0°4.93005|0°452866 
0°498727|/0°458715 
0°4.94064|0°4 54323 
074.6406 5/0°42.4.370 
0°488870/0°'449251 
0°491145/0°45 1620 
0°473123/0°434296 
0°4.66487)/0'428069 
0°4.65575|0°427211 
0°465577|0°427214 
0°46 5190|0°426848 
0°473446 
0°4.72830 
0°470658 
07459360 
0°453170 
07451963 
0°572386 
0°572237 
01572239 
0°571876 
0°568831 
570558 
0°567712 
0°568677 
0°568530 
0'567068 
0°565640 
0°566881 
0°565922 
H. 
0°570655 
hy 
G. 
0°623398 
I2 
0°424781 
0°42.4647 
0°424659 
0°464929 
0464791 
0°4.64800 
0°464470 
0461520 
0421426 
0°4.618 5010421938 
0°461782)0°421898 
0°4.60506/0°4.20693 
0°4.604.14|0°420637 
0°4.59511/0°419754 
0°424340/4" 
0°4.63448)0°423430/4" 
0°4.60880]0°420965/4" 
0°45916910°419389/4" 
0°4.57864|0°41822414" 
Sum. 
5°472782 
4°098 664 
4°097612 
4°097618 
0°4 54003 
0°450171 
0°44.0482 
07440638 
0°438534 
0°44.1343 
0°439582 
0°44.0203 
0°4.31823 
0°4.18926 
O°4.17145 
0°374681 
0°4.00309 
0°392556 
0°373768 
0°391735 
0°373136 
0°392065 
0°398715 
07404854 
0°4.04.386 
Oi3ggn23 
0°305143 
o'gorri2 
0°371222 
0°396205 
0398699 
0°382309 
0°376630 
0°375845 
0°375850 
0°375512 
0°414799|4°002338 
0°411212|3°970379 
0°4.0201 3/3°892230 
0°4023 34/3°889875 
0°4.002.55|3°874598 
0*4.03071|3°894098 
0°401340|3°881143 
0°401985/3°885003 
0°394.501/3°807501 
0°382318/3°702204) 
0°381165|3°676543 
0°338790|3°377426 
0°3644.90/3°555305 
0°356750/3°500538 
0°338016|3°36810. 
03 56038/3°492736 
0°337444|3'362418 
0°3 56392/3°494544 
0°363049|3° 540926 
036965 1/3°574162 
0°369209/3°570336 
0°364046}3°531382 
0°370178)/3°571179 
0°366383/3°5 38002 
0°336534|3°3279%4 
0°361583/3°501395 
0°364.159]3°517132 
0°348380|3°389580 
0°343057/3°342311 
0°342320/3°335819 
0°342326|3°335827 
0°342.007]3°3 33076 
0°4.3 54.0310°3844.66|0°351222/3°390271 
0°434839|0°383972/0°350773|3°385854 
0°4.328 3 5|0°382193/0°34914113°379317 
0°42.1983]0°371939|0°339277|3 290332 
0°4.16364]0°36708 5|0°334922|3'245859 
0°4.15232|0°366052|0°3 33954] 3°237207 
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