238 PROFESSOR HANSTEEN ON THE MEAN HEIGHT OF 
Place. Observer. ime. Difference. 
Christiansborg Trentepohl & Chenon| 22 mo. 
Guayra. . Boussingault 
St Thomas . Hornbeck 
Rio Janeiro 
Eschwege 
Santa Cruz, Teneriffe | Escolar . Bix. 
Madeira. . Heinecken . . Dy. 
Cape of Good Hope Puhlman and Wahlst Oy 
Palermo : Cacciatore 5 y. 
Naples Brioschi TY: 
Florence Inghirami 9y. 
Avignon Guérin 0 y. 
Bologna Caturegli and Moratti| 5 y- 
Padua The Astronomers . 5 y- 
Paris Bouyarde. sj. ly. 
London . Royal Society . 1 ¥: 
Altona Schumacher 6 y. 
Danzig : Strehlke 2y- 
Konigsberg Sommer . 8 y. 
Apenrade Neuber . 5y. 
Edinburgh . Forbes 3 y. 
Christiania . Hansteen 5 y. 
Reikiavik Thorslenson zy 
Godthaab Mihlenpfort 5 y. 
Godhaven Graah and Baan 23 y. 
Bosekop. . | Thomas . by: 
Melville Island ~») | Parry ly. 
Spitzbergen . . | Scoresby 6-1 

The formula gives a minimum for > = 0°, and ¢ = 68°28’8, and a maximum 
for @ = 86°:12’6, and ? = 90°. The following table gives y for every fifth degree 
of latitude. 
? + Q Y 
0 336-995 45 338-101 
5 7-012 50 7-246 
10 7-096 55 6:240 
15 7-291 60 5345 
20 7-623 65 4-801 
25 8-057 70 4-715 
30 8-478 75 5-037 
35 8-714 80 5-561 
40 8612 85 6-034 
45 8-101 90 6-216 


* So in the original, and also in Schouw’s Tables; but surely a mistake.-—J. D. F. 
