Observations of the spots on the sun from November 9, 1853, to March 24, 1861, made at Redhill Q Science
Observations on the biology of some Rhodesian bats : including a key to the Chiroptera of Rhodesia Q Science
Observations on the expediency and practicability of simplifying and improving the measures, weights, and money used in this country, without materially altering the present standards Q Science
Observations on Mexican history and archæology, with a special notice of Zapotec remains, as delineated in Mr. J. G. Sawkins’s drawings of Mitla .. Q Science
Observations on the nature of demonstrative evidence, with an explanation of certain difficulties occurring in the elements of geometry, and reflections on language Q Science
Observations sur l’électricité où l’on tâche d’expliquer son mécanisme & les effets sur l’oeconomie animale : avec des remarques sur son usage Q Science
Observations upon the late great comet and transit of Venus, made at Crowborough, Sussex, in the year 1882 Q Science
