From:
Friedrich August Hagenauer
To:
Ferdinand Jakob Heinrich (Ferdinand) von Mueller
Date:
[12 Sept 1867]
Source of text:
DAR 166: 80
Summary:
Replies to CD’s queries about expression.
Contributor:
Darwin Correspondence Project
Replies to CD’s queries about expression.
Comments on GA's theory of the thermo-electric origin of terrestrial magnetism.
Is very pleased with resolution about the observations of Charles Rümker [see Edward Sabine's 1867-8-30].
It appears that the Indian government has now approved the introduction of the metric system; JH is very upset.
Has been observing sunspots and talks about sunspot cycles; JH is glad to see that son John has been practicing observing with the spectroscope in preparation for the Indian solar eclipse [see JH's 1867-6-12].