454 TKANS. ST. LOUIS ACAD. SCIENCE. 



Mr. B. D. Kribben again aided the survey by assuming charge 

 of the weather service during the summer. 



It is perhaps proper to state, that, owing to the fact that we 

 could control our own movements perfectly, we were enabled to 

 do about four times as much work as in previous years when we 

 travelled by rail. 



When travelling from one station to another a star observation 

 for meridian was made at every camp and the eastern elongation 

 of the needle was determined the next morning, even when we 

 did not care to do more. In such cases the mean scale reading 

 of the magnet for the day was calculated by subtracting 3.- divi- 

 sions or 7'.Q from the reading at eastern elongation, correcting to 

 the axis in the usual way. 1 his value for half the daily swing is 

 calculated from 33 complete determinations made during the 

 summer. The probable error of one determination is 2'. The 

 work at a complete station was generally finished about 4 o'clock 

 P.M., and we invariably moved from five to ten miles before 

 camping for the night, making a check determination as explained 

 above. The barometer and thermometers were usually read at 

 7 A.M., 2 P.M., and 9 P.M., St. Louis time, observations at the 

 University being made at the same hours. 



The stations where observations were made are described be- 

 low, the numbers being continued from previous reports. 



Station 55 — near Clayton, St. Louis Co. Lat. 38° 41 ' ; Ion. 90° 19'. 

 On the farm donated by George Partridge to Washington University. The 

 observations were made directly in front of the house and 73 ft. from the 

 line of the front fence. The alarm clock failed to awaken us and the pole- 

 star observation was missed. The meridian was therefore determined by 

 sun observations the next day. 



Station 56. Lat. 38° 38' ; Ion. 90° 23' . On the grounds of Rock Hill 

 church, near the Ten-mile House on the Manchester road. Observations 

 in the N.E. corner of the parsonage grounds. The N.E. corner of the 

 house bears N. 87° 10'. 3 W., distant 66 ft. The eastern elongation of the 

 needle was taken. 



Station 57 — Pacific, Franklin Co. (formerly called Franklin^. Lat. 

 38° 28'; Ion. 90° 44' . Observations under a large sycamore on the left 

 bank of the Meramec river and 48 ft. from the water. A flagstaff near the 

 depot bears N. 59° 57'. «• W. Polaris observations for meridian and morn- 

 ing elongation of needle taken. This station is perhaps half a mile S. of W. 

 from the station of 1880, and the observations of the two years agree 

 fairly well. 



