ASTRONOMY AND METEOROLOGY. 387 



those of their termination. 3d. That ozone and cirri always accompany each 

 other, and would appear to be peculiar to the south or equinoctial current. 

 The author therefore designates the south points of the compass as those of 

 ozone and cirri, and the north or polar points those of no ozone and no cirri. 

 4th. That snow and thunderstorms take place generally in the south-east 

 points, and during calms ; while hail and auroras are peculiar to the north- 

 west points. 5th. That the maximum of disease occurs with the wind in the 

 south points, and the maximum of mortality when in the north points. 6th. 

 That some diseases are peculiar to certain directions of the wind. 7th. That 

 apoplexy, epilepsy, paralysis, and sudden deaths are very common during hail 

 and snow showers, and when the wind is in the points at which these phe- 

 nomena generally occur viz., the north-west and south-east. 8th. That 

 ozone is in greater quantity on the coast than in inland districts. The author 

 concludes by stating that owing to the action of light, and the influence of 

 atmospheric currents in producing decomposition of the iodide of potassium, 

 it is necessary, in order to secure uniformity of results, to place the test pa- 

 pers in darkness, and to keep them protected from atmospheric currents. 



SATURN AND URANUS. 



The following summary of the results of the labors of the distinguished 

 astronomer, Mr. Lassell, at Malta, have been transmitted to the Royal Astro- 

 nomical Society of England. 



He says, "Excepting the transparency of the obscure ring of Saturn, per- 

 haps my discoveries abroad were rather negative than positive. I ascertained, 

 at least to my own conviction, that no other satellite exists about Neptune 

 large enough to give hope of discovery without considerable improvement of 

 our telescopes. Also, that while I was enabled most fully to confirm my 

 discovery of the previous year, of two new and more interior satellites of 

 Uranus, I arrived at an equally strong conviction that these two, together 

 with the first two satellites simultaneously discovered by Sir "W. Herschel in 

 1787, constitute the whole of the planet's retinue hitherto discovered. In 

 the nebula of Orion I have, I believe, seen some minute stars in the neighbor- 

 hood of the trapezium which are new. On the other hand, some of Mr 

 Bond's stars I have not been able to make out. A comparison of Sir John 

 Herschel's, Mr. Bond's, and my own drawings of this wonderful object must, 

 I think, suggest the idea of change in the nebula, or variability of the stars, 

 or otherwise, a less uniformity of delineation of the same thing than might 

 have been hoped for." 



NOTE ON THE EXTENT OF OUR KNOWLEDGE RESPECTING THE 



MOON'S SURFACE. 



Taking advantage of the special attention paid at present to certain astro- 

 nomical disquisitions, the author called attention to a particular point connected 

 with the moon, which was first stated by the author of " The Plurality of 

 Worlds," and then made by him to prove that the moon must be uninhabited, 



