prevalent Disorder s, Sfc, "with Volcanic Emanations, 6] 1 



History^ relates a similar occurrence which took place at 

 Colombo in Ceylon, when he was there; and he says the 

 butterflies were in " incredible numbers ; " and, " for the 

 greater part of several successive days, passed down the 

 road in a northerly direction." Mr. Lyell has also observed 

 the periodical emigration of certain other ungregarious insects ; 

 an instinct only developed in rare emergencies. (GeoL, ii. 115.) 



The country papers mention several instances of extra- 

 ordinary visitations of very small black flies, so numerous as 

 to cling by hundreds to the faces and dresses of persons, dur- 

 ing the end of the month of September, 1834<. They were 

 noticed at Spalding (Lincolnshire Chronicle) on Sept. 28. ; 

 and at Colchester and Chelmsford {Essex Standard) on Sept. 

 29. and 30., and Oct. ]. At the same time, a flight was also 

 observed at Topsham, Devon, more than three quarters of a 

 mile in length, travelling in the direction of the wind, which 

 was blowing gently from the s.e. [Morning Herald,) A 

 similar flight was noticed at Halifax and York, on Sept. 29. ; 

 and, about the same time, at Cheltenham, and at Stroud. 



Mr. Foster, in his Calendar of Nature, appended to his 

 work On the Atmosphere^ mentions, in p. 427., that, on July 

 17. 1822, he "noticed the immense quantity of butterjlies 

 covering whole fields for miles together, in the neighbourhood 

 of Boulogne;*' and, on July 26. 1822, at Pont-y-Pani, he 

 saw Jlies so numerous that, " in some places, the wall was 

 quite black with their settling on it." 1822 was, as before 

 named, especially a hot volcanic year. 



In farther illustration of No. 3. of these essays [289 — 308.] 

 and its supplement (385, 390.), we may here, at once, refer to 

 some additional particulars relating to the meteors of Nov. 13. 

 1833; which have appeared in the July number of the Ame- 

 rican Journal (xxvi. 320.), in a very interesting paper on the 

 subject, by Alexander C. Twining, civil engineer, and late 

 tutor in Yale College, entitled, " Investigations respecting the 

 Meteors of Nov. 30. 1833; Remarks upon Professor Olm- 

 sted's theory respecting the cause." 



Mr. Twining states that the whole space yet traced, over 

 which the meteors were seen, extends from the Lakes to the 

 middle of the Gulf of Mexico; and from 61°w. to Central 

 Mexico, in long. 100° ; that there was a tmlight on the morn- 

 ing of the 1 3//z, between Jive and six o'clock, issuing from the 

 whole south-eastern and southern quarter, while the western and 



cal Journaly a similar instance. A species of Celiac was observed to pass, 

 in an extended column, across the Island of Trinidad, and the neighbour- 

 ing Gulf of Paria. — L. Guilding. St. Vincent, May 1. 1830."] 



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