48 M. POUILLET ON SOLAR HEAT, 
H . Observed Calculated : 
observation, | Densities ort | pS Ot | tenet | Dilfernees 
| 
Observations of the 28th of June, 1837. | 
° ° i 
7» 30' morn. 1-360 3°80 3°69 +011 | 
10" 30’ morn. 1-164 4:00 4:62 — 0°62 
INCOM. jeee0. 1.107 4-70 470 0- 
a siiaede oy 1:132 4:65 4:67 — 0°02 
Rims iaceke's ss 1:216 4:60 4:54 +0:06 
OE se osc 5% LES AVE Bh Ree 4:32 0: 
ie wey eins cans 1:648 4:00 3°95 +0°05 
Badd tes 2 Voitan alt tat tee See 3°36 
Gr aaiadesacs 3165 2:40 2°42 —0:02 
Observations of the 27th of July, 1837. 
INoneeeeis.< 1/147 4:90 4:90 0° 
UH Fe eats soc 1-174 4°85 4:86 —0-01 
De ioaecan ans 1:266 4:75 4:74 +0-01 
te cseheesec 1-444 4:50 4°51 —001 
Aleck Be scotaeh 1-764 4:10 4:13 —0:03 
D xepeeds Aina t 2174 3°50 3:49 +0°01 
Ge tateeenont 3°702 3°35 3°42 —0:07 
Observations of the 22nd of September, 1837. 
Noone. .o.0.- 1:507 4:60 4:60 0° 
OP caddnapsse 1559 4-50 4:54 —0°04 
Dibevekcnees ues 1:723 4:30 4:36 —0 06 
Diseases 2102 4:00 3°97 + 0:03 
1 ns RRA 2:898 3:10 3°24 —0'14 
MD Relea! vat OORT Mvp a hegdees 1:91 
Observations of the 4th of May, 1838. 
INGontes..ce-0 1191 4:80 4°80 | 0: 
MDE c iacees 1:223 4:70 4:76 —0:06 
ig teupe dees «ur 1-325 4:60 4:62 —0:02 
Dhiccsvsdecese. 1°529 4:30 4°36 —0:06 
Ae cchartsest 1-912 3:90 3:92 —0-02 
Sieg sashes 2°603 3°20 3°22 —0:02 
Gr Sc3a "tre 4°311 1:95 1:94 +001 
Observations of the 11th of May, 1838. 
GUD, seeetoedets 1-193 5:05 5:06 —0:01 
VO beenwcasccss 1164 5:10 5:10 0: 
itaw ace viens «2 1:193 5:05 5:06 —0:01 
Ct eee 1:288 4°85 4:95 —0:10 
ee ccst sees 1:473 4:70 4:73 —0:03 
AME WG acteece sen 1-812 4:20 4:37 —0:17 
Deer since cuves 2465 3°65 3°67 —0:02 
(ean SeaRCee 3°943 2-70 2°64 +0:06 
3. After having obtained, in the course of several years, a large 
number of series analogous to the preceding, I endeavoured to 
discover a law which might represent with sufficient exactness 
