The most complete polarisation seems to take place near the horizon; and, when the sun is near the meridian, towards the west and east. The depth of colour appears to be immaterial, as far as I have been able to ascertain with an instrument but rudely constructed for the purpose. The light is polarised in planes passing through the {410} eye of the observer, and arcs of great circles intersecting the sun's disc. From the absence (so far as I am aware) of all mention of this remarkable fact in works on the subject, I am led to conclude that it is something new; should this, however, turn out otherwise, I shall be obliged by a reference to any author who explains the phenomenon. The greater intensity towards the horizon would point to successive refractions as the most probable theory. H. C. K. * * * * * MINOR QUERIES. _"Salus Populi," &c._--What is the origin of the saying, "Salus populi suprema lex?" E. M. _Dramatic Representations by the Hour-glass._--I have seen it stated (but am now unable to trace the reference) that, in the infancy of the drama, its representations were sometimes regulated by the hour-glass. Does the history of the art, either among the Greeks or the Romans, furnish any well authenticated instance of this practice? HENRY H. BREEN. St. Lucia. _John Campbell of Jamaica._--I shall be very much obliged if any of your readers can give me any information respecting John Campbell, Esq., of Gibraltar, Trelawny, Jamaica, who died in January, 1817, at Clifton (I believe), but to whose memory a monument was erected in Bristol Cathedral by his widow. I should be glad to know her maiden name, and whether he left any surviving family? Also how he was related to a family _going by the name_ of Hanam or Hannam, who lived at Arkindale, Yorkshire, about one hundred years before the date of his decease; he appears, too, to have had some connexion with a person named Isaac Madley, or Bradley, and through his mother with the Turners of Kirkleatham. This inquiry is made in the hope of unravelling a genealogical difficulty which has hitherto baffled all endeavour to solve it. D. E. B. Leamington. _Hodgkins's Tree, Warwick._--In the plan of Warwick, drawn on Speed's Map of that county, is a tree at the end of West Street, called on the plan "Hodgkins's Tree:" against this tree is represented a gun, pointed to the left towards the fields.--Can any of your readers furnish the tradition to this tree pertaining? O. L. R. G. _The Doctor, &c._, p. 5., one volume edition.--The sentence in the Garamna tongue, if anagrammatised into "You who have written Madoc and Thalaba and Kehama," would require a _k_ to be substituted for an _h_ in _Whehaha_. Query, Is this the proper mode of interpretation, or is there a misprint? _Saheco_, p. 248.--What name are these composite initials meant to represent? The others are easily deciphered. Should we read _Saneco_=Sarah Nelson Coleridge?