Asks what AD knows about the Andersonian Institution in Glasgow, which JH's son Alexander is considering as a place of employment. JH then deals with a problem in probability theory, and concludes the letter with a riddle.
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Asks what AD knows about the Andersonian Institution in Glasgow, which JH's son Alexander is considering as a place of employment. JH then deals with a problem in probability theory, and concludes the letter with a riddle.
Selling house [in London]; comments on H. S. Boase's writing on annuities.
A story about Voltaire; arrangements to visit AD.
Raised from his lethargy by the appearance of the comet; comments on the nature of the sun; can AD recommend a book on surveying for JH's son John.
Comments on family health; asks AD if he has read James Challis on the topics of the ether and of zodiacal light.
JH's inability to concentrate; comments in reply to AD's 1862-4-19 and 1862-4-29.
Hopes AD will be successful in his projected paper on the infinity of magnitude. Does not recollect the paper by J. J. Sylvester. Has had a letter from Manchester on his own theory of eternal existence.
On preparing convenient small tables to be carried with one; comments on concept formation.
Agrees that the weather is hot. The word theodolite. Where did he obtain his verses by Walter Mapes? Why not come and visit them?
Comments on Greek fire lead JH into a variety of recollections.
Comments on metrification.
Comments on some mathematical problems; asks if AD knows about a German geometer by the name of [Bernhard] Riemann; suggests some new names for trigonometry.
Comments on health of family, and on parliament considering a bill to change weights and measures.
Comments on the state of JH's health; about ciphers and about decimalization.
Comments on remedies suggested by AD [see AD's 1864-7-15]; on ciphers.
Comments on minting of coins [see AD's 1864-8-18], the state of JH's health, and the need for an elocution teacher for one of JH's sons.
On algebraic signs, riddles, and the state of JH's health.
Longs to hear from AD; comments on JH's health and on the weather.
On concept formation.
About old friends, alive or dead; comments on a puzzle in probability; returns to JH's old haunts.