ee en ee ee 
é. 
Bf 
OS Ee Ee eee ee 
E. Loomis— Observations of the U. S. Signal Service, 5 
tary and seldom included both early morning and mid-day. 
The following are the only cases I have found in which two 
observations of the same day differed as much as 40°. The 
table shows the date of observation ; the temperature observed ; 
the difference between the two observations of the same day ; 
the latitude in which the observation was made and the eleva- 
tion above the sea as accurately as can be determined from the 
published maps of the expedition : : 
Temperature in Central Africa. 
Date. Temp.| pist.| Lati- |Alti’e Date. Temp.|Dirt.| Gaye |4athe 
1850. E ee 1852. eS ER oe 
April 13. 5.15 a.m.) 50 |,)../30 37/ 531//Jan. 26. Sunrise.| 52°7),).,/11 36) 900 
2 P.M) 91:8 1.30 P. M.| 93°2 
14.5 a.M.| 43°2 42°8 30 37) 531]|Mar. 23. Sunrise.) 58 43°5 1l 47} 830 
oon.| 86 P. M.|103°5 ; 
24, 5.30a.M.| 40°1 423 28 20) 696)/April 1. Sunrise.| 63 43°2 11 40; 900 
Noon.| 8274 .30 P. M.|106°2 
25.5 a.M.| 46-4 63-0 27 46) 921),\Nov. 25. Sunrise.) 41 50 12 55} 880 
2 Pp. M.|109°4 1.30 P. M.| 9 
July 12. 6.15 4. M.| 65°3 414 25 37|1435||/Dee. 5. Sunrise.) 47 47 13 0} 900 
1 Pp. M.j106°7 1.30 P. M.| 94 
; 18, 4.45 a. M.| 64:4 414 25 05)1349 1853. 
2.15 P. M.|105°8 April12. Sunrise.| 64 44 13 15 
Nov. 12. Sunrise.| 43°7 42°3 18 23/1894 2 p.M.j108 ; 
-15 P. M.| 86 April13. Sunrise.) 66 |,, [13 15 
bi 2 Pp. M#l109 
Mar. 18. Sunrise.| 64°4 446 12 47)1360 1855. 
> June 18. Sunrise.) 69 |,, |19 42 1000 
1852. 2 Pp. M./109 
Jan. 7. Sunrise.| 59 41-4 10 18} 900 
1.30 P. M.|100°4 
These observations bear an obvious resemblance to those 
made in Arizona, and show that in a very dry climate the 
diurnal fluctuations of temperature are excessive, and seem to 
leave no doubt that this is the chief cause of the great changes 
of temperature shown in the table on page 2, and that at the 
more northern stations this cause is combined with the fluctua- 
