8 8 
M. Humboldt on Isothermal Lines, 
Lat. 47° 19' ; mean temp. 50°.9. Besan^on, height, 804 feet ; 
Lat. 47° 14' ; mean temp. 51°.26. 
43 Six years. Duplessis, and Boudan. Temperature of the 
summer too high ? Rochelle, 58°. 0 6 ; Poitiers, 52°. 7. 
44 Amyot. Six years. Concave. Asiatic summit. Three 
months below 82°, as at Copenhagen ; the summer like that at 
Naples. 
4 5 One of the best determined points* The years 1789— -1812 
are calculated in decads of days. Observations of the Astrono- 
mer Reggio, April, 55°. 76; Oct. 58°. 1. The two decads which 
approach the nearest to the mean temp, of the year, are, the first 
of April, 58°.24 ; and the last of Oct. 54°.68. The mean temps, 
for January have varied in 10 years from 24°.98 to 38°. 48 ; 
those of July, from 71°. 42 to 78°.44; the mean of the years, 
from 54 °.5 to 57°. 2. (Reggio, taking only 24 maxima and mi- 
nima in a year for 1763 — 1798 ; mean temp. 55.4, Ephem. Mil. 
1779, p. 82.) 
46 Ten years. Guyot. Lyons, 528 feet, 55°.76. Mafra, 
near Lisbon, Lat. 38° 52' ; height, 600 feet ; mean temp. 56°.3, 
too small. Mem. de Lisbonne , ii. 105 — 158. 
4 7 Seven years, (1777—1782). St Jacques de Sylvabelle. 
The thermometer sometimes descends to 23°. Cotte, Traite de 
Met. ii. 420.) 34 years (Raymond, in Mem. de la Soe. de Med. 
1777, p. 86.) give 62°. 06. Cotte ( Journ. de Phys. xxxix. 21.) 
fixes it at 58°.64. Kirwan, at 61°.24. The observations made 
at the Royal Observatory of Marseilles can alone decide. 
4 8 Ten years. Nismes, 60°.26 ; Perpignan, 59°.54 ; Taras- 
con, 59°.9 ; Arles, 59° ; Rieux, 57° 2 : Montauban, 55°.58 ; To- 
nains, 54°.86; Dax, 54°.14 ; Rodez, 57°,02; Aix, 56°.66. Un- 
der the equator, 57°.74, at 9,000 feet of elevation. 
4 9 William Humboldt. Calandrelli, 60°.08. The thermo- 
meter sometimes descends to 24°.5, and rises to 99°.5. Naples, 
67°. 1 ; Toal do, probably 63°. 5 ; Florence, 61°.52 ; Tartini, too 
high; Lucca, 60°.44; Genoa, 60°.26 ; Bologna, 56°. 3 ; Verona, 
55°.76 ; Venice, 56°, 48 ; Padua, 56°.3. Kirwan regards it as an 
established fact, that in Europe the mean temp, in Lat. 40°, is 
61°. 88 ; in Lat. 50°, 52°.52. 
5 0 Only two years. Barberet, and d'Angos. Sheltered by 
mountains. Estimate a little too high. 
