1To Thomas Jefferson from Benjamin Waterhouse, 8 June 1801 (Jefferson Papers)
...our object through a mist.” My insulated situation, and remoteness from all correct information on this head, has compelled me to the closest observation of the progress of the pustule, even from hour to hour, with the microscope; and I am convinced of the importance of Dr. Jenner’s injunctions to me; nay more, I am convinced by my own blunders.
2To Thomas Jefferson from Benjamin Waterhouse, 2 September 1801 (Jefferson Papers)
...than the 9th. The efflorescence is a sign that the absorption has commenced, and the nicety of the business is to take the virus just before that period. I have watched this process with a microscope in a number of persons whom I had taken into my house for this express purpose, and experience has now taught me a sure procedure, somewhat different from my early theory, which was to...
3To John Adams from François Adriaan Van der Kemp, 3 January 1802 (Adams Papers)
. These are in Maÿ and Juin full of a milkÿ juice—in which the Eggs by assistance of a microscope are discoverable. This glutinous humour undergoes various changes, and receives different accretions before the two shells in the centre are discoverable, and about this time—or a little later in August: the spatts are ejected. At this......, which theÿ filled there have been seen with a microscope...
4To Thomas Jefferson from William Dunbar, 2 February 1805 (Jefferson Papers)
...is supposed to be greater in summer, particularly in dry weather. In water of 130° which was comparatively in a state of repose to one side of the spring run, I found by the aid of an excellent microscope, both Vegetable and animal life; the first a species of moss, the latter a
His observation from vol. i pag. 10 on the 12 Dec. respecting fish-spawn colouring the sea—confirms your’s and Rumphius observations—It is a pity, that he could not examine it with a microscope—Sebald de Weert,
6To John Adams from John Quincy Adams, 8 March 1805 (Adams Papers)
...at Baltimore, containing political opinions, obnoxious to the predominating sentiments of the day, and to the party now in power—This was certainly not a very prudent act, but even the microscope of party Spirit could not magnify it into an impeachable misdemeanour.—The constitutional majority necessary to convict could not be obtained for any of the charges separately, nor for the whole...
7From Thomas Jefferson to Benjamin Smith Barton, 21 May 1805 (Jefferson Papers)
...to send some moss which he had taken out of the hotsprings of the Washeta, in a temperature of 150.° in which he says are some of the animalculae, inhabitants of the moss. Th: J. having no microscope here has been unable to see them: but he commits them now to the better hands of Doctr. Barton.
8From John Adams to Benjamin Waterhouse, 24 July 1805 (Adams Papers)
...he Seperated these parts, and found in one of them a Soft Substance, consisting of innumerable membranes of a retiform appearance, which constitute the Animal part of the shell, and through a Microscope exhibit proofs of a vacular Structure. This membranous Substance, is a continuation of the tendinous fibres, by which the animal is fixed to the Shell, the hardness of which is owing...
9From John Adams to Benjamin Waterhouse, 9 August 1805 (Adams Papers)
...distinguished from Alga, principally by its Leaves, separated into branches and cutt sloping, like the Leaves of the Oak. Some of the Species have Vescicles, on their Leaves: on Some others are perceived black points, which the Microscope discovers to be Shell fish....the partition of the Case. They are discernible by the naked Sight: but a Microscope, or at least a magnifying glass is...
10To James Madison from James Leander Cathcart, 30 September 1806 (Madison Papers)
...and his prime minister or Sahib-at-Taba, Jussuf Hoggia, since the intended “arrangment ha[d] been alter’d” after the packages were marked. The gifts mentioned included fabrics, mathematical instruments, a microscope, sets of plate and china, and loaf sugar. Cathcart noted that Melimeni had advised on and approved the purchases. At the foot of the letter, Cathcart stated that a copy of it and...