From Mary Stevenson
Draft: American Philosophical Society
June 6th. 60
The Happiness I enjoy’d last friday5 has afforded me pleasing reflections for the week past. I attended with delight to your kind Instructions, and my highest Amusement ever since has been to recollect them. You obligingly condescended to satisfy my Curiosity about the Barometer, and by your explanation I clearly conceived the cause of the rise and fall of the Mercury; but, upon looking at it after you were gone, I was puzzl’d to find out how the Air has access to the end of the Tube which you told me was left open to relieve its pressure, it being cover’d with Wood. You bid me not apprehend you should think it a Trouble to receive and answer my Questions,6 therefore I take the liberty of desiring you to solve this difficulty when you can afford to bestow a little time upon your grateful Polly.
I have read the first Volume of your Books,7 which has afforded me great entertainment. I was highly pleas’d with the discription of Insects, which lead me to admire that Wisdom and Power that created them, and assign’d to each their proper use and employment: and taught me to observe there is nothing so trifling but it is necessary and worthy our attention. The Opinion that Corruption produces Insects is very well refuted from the certainty that Chance has no agency, and their always appearing in Putrified Meats is very well accounted for; but I am left in the dark, whether those Insects would ever arrive at the state of their parent. I find moral reflections frequently inserted so that my reading will not be a useless amusement only to satisfy an Idle Curiosity. I am my dear and honourd Friend most gratefully and affectionately yours
5. BF had apparently visited Polly at Wanstead.
6. BF invited questions from Polly in his letter of May 17, 1760; see above, p. 117.
7. See above, p. 102 n, for BF’s gift of Pluche’s Spectacle de la Nature, the first volume of which has eight dialogues about insects.
8. Written lower on the page and in another hand, probably by one of Mary Stevenson Hewson’s sons many years later, appears the notation: “Copies of my mothers letters to Dr Franklin.”