February 12, 1777
About the beginning of July, a species of Fly (Musca) obtains, which proves very tormenting to horses, trying still to enter their nostrils, and ears, & actually laying their eggs in the latter & perhaps in both of those organs. When these abound, horses in wood-land districts become very impatient with their work, continually tossing their heads & rubbing their noses on each other, regardless of the driver: so that accidents often ensue. In the heat of the day, men are often obliged to deist from plowing: saddle-horses are also very troublesome in such season. Country-people call this insect the nose fly. In the decline of the year when the morning & evening become chilly, many species of flies (muscae) retire into houses, & swarm in the windows. At first they are very brisk & alert: but as they grow more torpid, one cannot help observing that that they move with difficulty, & are scarce able to lift their legs, which seem as if glued to the glass: and by degrees many do actually stick on till they die in the place. Now as flies have flat skinny palms, or soles to their feet, which enable them to walk on glass & other smooth bodies by means of the pressure of the atmosphere; may not this pressure the the means of their embarrassment as they grow more feeble; ’til at last their powers become quite inadequate to the weight of the incumbent air bearing hard upon their more languid feet; & so at last they stick to the walls & windows, where they remain, & are found dead.
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