1 3 OF INSTINCT. SECT. XVI. 1 6. a. 



perience and tradition, as the arts of our own fpecics ; though 

 their reafoning is from fewer ideas, is bufied about fewer ob- 

 jeds, and is exerted with lefs energy. 



There are fome kinds of infects that migrate like the birds 

 before mentioned. The locuft of warmer climates has fome- 

 times come over to England ; it is fhaped like a grafshopper, 

 with very large wings, and a body above an inch in length. It 

 is mentioned as coming into Egypt with an eaft wind, " The 

 Lord brought an eaft wind upon the land all that day and night, 

 and in the morning the eaft wind brought the locufts, and cov- 

 ered the face of the earth, fo that the land was dark," Exod. x. 

 13. The migrations of thefe infedts are mentioned in another 

 parr of the fcripture, " The locufts have no king, yet go they 

 forth all of them in bands," Prov. xxx. 27. 



The accurate Mr. Adanfon, near the river Gambia, in Africa, 

 was witnefs to the migration of thefe infecls. " About eight in 

 the morning, in the month of February, there fuddenly arofe 

 over our heads a thick cloud, which darkened the air, and de- 

 prived us of the rays of the fun. We found it was a cloud of 

 locufts raifed about twenty or thirty fathoms from the ground, 

 and covering an extent of ieveral leagues ; at length a fhower of 

 thefe infecls defcended, and after devouring every green herb, 

 while they refted, again refumed their flight. This cloud was 

 brought by a ftrong eaft wind, and was all the morning in pall- 

 ing over the adjacent country." (Voyage to Senegal, 158.) 



In this country the gnats are fometimes feen to migrate in 

 clouds, like the mufketoes of warmer climates, and our fwarms 

 of bees frequently travel many miles, and are faid in North 

 America always to fly towards the fouth. The prophet Ifaiah has 

 a beautiful allufion to thefe migrations, " The Lord ihall call 

 the fly from the rivers of Egypt, and {hall hifs for the bee that is 

 in the land of Aflyria," Ifa. vii. 18. which has been lately ex- 

 plained by Mr. Bruce, in his Travels to difcover the Source of 

 the Nile. 



2> I am well informed that the bees that were carried into 

 Barbadoes, and other werften iflands, ceafed to lay up any honey 

 after the iirft year, as they found it not uieful to them : and are 

 now become very troublefome to the inhabitants of thofe iflands 

 by infefting their fugar-houfes , but thofe in Jamaica continue 

 to make honey, as the cold north winds, or rainy feafons of that 

 illand, confine them at home for feveral weeks together. And 

 the bees of Senegal, which differ from thofe of Europe only in 

 flze, make their honey not only fuperiour to ours in delicacy of 

 flavour, but it has this fingularity, that it never concretes, but 

 remains liquid as fyrup, (Adanfon). From fome obfervations of 



Mr. 



