on Solar physics and terrestrial magnetism, can do me the great favour to try my method, and inform me if your arrangements would permit of your adding this class of observations to your others, at least for a time. According to my method, the observation, thrice repeated, commonly takes less than 12 minutes, exclusion of a detail of the forms of the spots, which requires 4 or 5 minutes more, so that coming in the day, and being practicable at any reasonable time of the middle of the day, it would not probably be found very exacting. I should be glad to hear about this from you at your convenience, and will only now add one hint which might not immediately strike you, namely that if the spots are numerous, or peculiarly situated, it is occasionally convenient to observe the panorama over the two series separately and alternately.
Believe me to remain
with great respect
yours faithfully
R.C. Carrington
To Prof. Secchi
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