Discusses the movement of the 'great group' of sunspots over the last six months. Asks WS to sign a certificate for his son [John].

Thanks WS for August 29 photographs. Is sending JH's son's [John's] certificate. Pities the 'fallen Emperor' [Napoleon III].

Some comments about the proposed title change [see GA's 1870-7-31].

Apologizes for not writing often. Has been ill. 'Moderate' use of 'Coca de Peru' [cocaine] helps. Is working on a 'General Catalogue of double stars reduced to 1830.0.' Acknowledges works received.

Inconceivable that JH merely writes 'J'accepte' (I accept) in response to the great honor AQ bestows upon him by dedicating his book to JH. Congratulates AQ on his 'fresh contribution to statistical knowledge.' Has just completed his catalogue of approximately 10,000 double and multiple stars.

Thanks for work on diamagnetism and magne-crystallic action [Researches on Diamagnetism (1870)], which JH is excited to read. Mentions long-abandoned plans for magnetization experiments. Envies those who can see JT's 'magic' experiments at Royal Institution.

Thanks for paper on action of rays 'of high refrangibility' on gases and vapors. Attempts to understand reflection of wave motion on particles with diameters 'incomparably smaller' than length of wave.

ES has been forwarded letter explaining why 'great telescope' at Melbourne will not work and suggesting construction corrections, on which JH, who believes such 'a priori condemnation' unjustified, comments herein.

Cannot attend Eclipse Committee meeting but suggests that an observer carefully look for planets interior to Mercury's orbit, which would, if existing, reach conjunction during total solar eclipses.

Approves of ES's actinometric methods, but wonders about absorbent power of alcoholic liquid. Laments 'sad conclusion' to career of 'Hansa,' and hopes her companion is more successful.

Discusses significance of Col. Napier's pendulum observations to research on earth's constitution and gravitation.

Thanks for many works, especially double star catalogs, about which JH requests further information, and which will help JH's attempt to compile digest of all measures of all known double stars.

Thanks for telegram and has dispatched papers about absorption power of actinometer liquid. Hopes letter written in Lady Sabine's handwriting does not indicate serious illness of ES.

Is preparing a catalogue of all double star observations, and is having much difficulty with the observations of J. H. Mädler.

Thanking him for copies of books. People at Collingwood are gazing at the eclipse. Concerning the astatic needle.

Relationship of electricity to magnetism, and relevance to 'auroral streamers'.

Thanks for his pamphlet on 'Trade Unions and the Cost of Labour.' Comments on this.

Reply to FC's 1870-2-8.

Advice and guidance on the path he is to pursue when he goes to university.

Of talking fishes, a great meteor falling in Tripoli, and the 'madness of man' in the wake of the Franco-Prussian War.