The two inventors became warm friends, and each disclosed to the other the minutiae of his discoveries.

Daguerre invited Morse to his workshop, selecting a Sunday as a day convenient to him, and Morse replied in the following characteristic note:-- "Professor Morse asks the indulgence of M.Daguerre.The _time_ M.
Daguerre, in his great kindness, has fixed to show his most interesting experiments is, unfortunately, one that will deprive Mr.M.of the pleasure he anticipated, as Mr.M.has an engagement for the entire Sunday of a nature that cannot be broken.

Will Monday, or any other day, be agreeable to M.Daguerre?
"Mr.M.again asks pardon for giving M.Daguerre so much trouble." Having thus satisfied his Puritan conscience, another day was cheerfully appointed by Daguerre, who generously imparted the secret of this new art to the American, by whom it was carried across the ocean and successfully introduced into the United States, as will be shown further on.
Writing of this experience to his brothers on March 9, 1839, he says:-- "You have, perhaps, heard of the Daguerreotype, so called from the discoverer, M.Daguerre.It is one of the most beautiful discoveries of the age.

I don't know if you recollect some experiments of mine in New Haven, many years ago, when I had my painting-room next to Professor Silliman's,--experiments to ascertain if it were possible to fix the image of the _camera obscura_.

I was able to produce different degrees of shade on paper, dipped into a solution of nitrate of silver, by means of different degrees of light, but finding that light produced dark, and dark light, I presumed the production of a true image to be impracticable, and gave up the attempt.