294 Professor MacGillivray om the Cirripedia. 
station, where the barometer stands at 30 inches, the boiling 
point at 212°. Then the height of the station, where the 
thermometer has been observed, above the imaginary station, 
is found by the preceding rule. 
For example : The corrected boiling point on the Cold’ Erin 
between Evolena and Zermatt, in the Vallais, on the 19th 
August 1842, was 191°.93, the external thermometer 34°., 
the barometer (English) at Geneva was 28.73, and the tem- 
perature 72, required the height. 
Then, by Galbraith’s table, for 30 inches, . 29228 feet 
28,73 — : 28098 
Difference, ; ; ; 1130 
Consequently, supposing the atmospheric temperature 32’, 
the barometer stood at 30 inches, at a level 1130 feet below 
Geneva. The boiling point at the upper station was 20°.07 
below 212°. The Col d’Erin was, therefore, 20.07 x 549.5 
= 11028 feet above that imaginary station, or 9898 feet 
above Geneva. Corrected for temperature, this gives 10377 ; 
and Geneva being 1343 feet above the sea, the height of the 
Col d’Erin is 11720 feet. 
This is purposely given as a complex case ; but let us sup- 
pose that the boiling point, at the level of the sea, is assumed 
to be 212°, then the approximate height of the Col d’Erin is 
549.5 x 20°.07 = 11028 feet ; and supposing the mean tem- 
perature of the column 54°, the height will be 11586 feet 
above the sea. 
Remarks on the Cirripedia, with Descriptions of several Species 
found adhering to Vessels from Ichaboe, on the West Coast 
of Southern Africa. By WILLIAM MACGILLIVRAY, A.M., 
LL.D., Professor of Natural History in Marischal College 
and University, Aberdeen. (Communicated by the Author.) 
A considerable degree of interest has always been attached to the 
Cirripedal animals, not only on account of the widely extended, 
though preposterous belief of their being the eggs of geese, but also 
because of their peculiar structure and habits, the rapidity with 
which they grow, and especially the metamorphoses which they have 
