11 



ther section that runs into Loudon. It is for this reason that we 

 find the locust twice in Loudon, at intervals of eight and nine years, 

 because they form two distinct generations, and will probably re- 

 main so forever, each experiencing its own decem septennial ascen- 

 sion. 



It would be as tedious as it would be unprofitable to detail the 

 periods of ascension in every part of the continent, where they are 

 known to have appeared; but as we desire to satisfy all who feel 

 an interest in the matter, w r e will add a few examples of the chro- 

 nology of their appearance in such places as we are properly ad- 

 vised of. Our inquiries on this head have not been as extensive as we 

 could have desired, but as much so as are deemed necessary for our 

 purpose. We give them in the promiscuous order we received them. 

 They appeared in Louisiana in 1829. We have no accounts from 

 Florida, where they must have been seen. They have not been found 

 (that we are aware of) in Mexico, nor in any other South American 

 province. They appeared at Galliopolis, in Ohio, in 1821, and in 

 Muskingum in 1829 in part of South Carolina and Georgia in 

 1817 and 1834 in Middlesex county, in Jersey, in 1826 in parts 

 of Pennsylvania, west of the mountains, in 1832 in Massachu- 

 setts, near Fall's River, in 1834 and in the greater part of Mary- 

 land in 1749, 1766, 1783, 1800, 1817 and 1834. We have no 

 account from North Carolina, but they must have appeared there, 

 as they have been found in all the adjacent states. We are at a still 

 greater loss for information from the northern and eastern parts of 

 the continent. We have none from the states of New York, Con- 

 necticut, Vermont, Maine, or New Hampshire, though they were 

 first described in Massachusetts. It is most probable they pervade 

 the whole continent, though it is possible the low temperature of 

 the far north may draw a line beyond which they cannot exist. 

 This remark, nevertheless, is rather intended to apply to the Cana- 

 das, New Brunswick and Nova Scotia, where, (if they ever were 

 seen) there is no tradition. Future observations must decide the 

 extent of their nativity. 



It has been supposed that there are certain localities that the lo- 



