Comments extensively on paper on limit of vaporization and its significance in helping to settle ideas on constitution of the atmosphere.
[More detailed version of JH's 1826-5-26]. Has mentioned it to Humphry Davy.
No summary available.
Wrote letter to clarify ideas, without intentions of publication. Discusses light and spectrum of Thomas Drummond's lamp.
No summary available.
Comments on the intent of remarks appended to a paper of MF's.
No summary available.
Chemical constitution of meteorites. JH suspects lead-iron alloy. Believes this has not been proposed before. Send specimen for JH's analysis.
Comments on GA's observing in Cornwall, and on the geodetic calculations made by GA in a paper read by JH.
No summary available.
Reports on interest at the Astronomical Society, especially of [Thomas J.] Hussey, in the plan of the Berlin Academy for a new star chart. JH cannot participate due to JH's commitment to re-examine his father's nebulae, which requires that JH reside far from London.
No summary available.
Sends directions for chrome solution and the magnetic apparatus and instructions for its use, as requested [in WS's 1826-8-2]. Discusses experiments with magnets.
Returns house keys. Smooth passage across Channel. Met James Grahame's brother-in-law, Mr. Robison, who is going to Paris to be married. James South arranged carriage for JH's travels in France. Servant James Child is well and observed four criminals executed in London before departing. News of Beckwiths.
Asks WW to watch over the printing of JH's 'Light' for the Encyclopaedia Metropolitana. Describes that work as not especially original and as free of historical information. Discusses JH's trip to Calais.
JH plans to explore volcanic districts of Auvergne and Vivarais, then along Rhine to Bonne and Andermatte. Has cancelled plan to cross to Staffa [Scotland] and explore there.
Journey from London and French countryside. Towns and Paris are vastly improved since 1801 visit. Charles Babbage and wife are in Paris. Received letters of introduction from Georges Cuvier, J. N. Nicollet, and J. P. Delessert for JH's expedition to Auvergne. Alexis Bouvard is recovering from fall. Georgianna Babbage has recovered and promised to write to MPH. [Letter continued 4 Sept. in Moulins:] Traveled more than 100 miles today. [Letter continued 5 Sept. in Clermont-Ferrand:] Massive flooding in Riom. Impressive view of volcanoes. [Letter continued 6 Sept.:] Will ascend Puy de Dôme today with two companions.
Two unwanted companions caused JH to waste two days in Clermont-Ferrand. Describes volcanoes and high winds on peaks. Actinometer experiments on Puy de Dôme. Hunting fossil bones of extinct animals.
Studying the volcanoes of Auvergne; hopes to use his newly-created actinometer at the Puy de Dôme.
Describes region around St. Flour, where servant James Child was seriously ill for two days. Low opinion of French physicians. Journey to Montpellier.