Thomas Jefferson Papers
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Thomas Jefferson’s Notes on Itch Lotion, [after 29 May 1818]

Notes on Itch Lotion

[after 29 May 1818]

60  grs = 1. drachm
8  drachms = 1. oz
480. grs = 1. oz
16  oz. = 1. pint
2880 
480  
7680  = 1 pint
3840 
11520  = 1½ pint or 24 oz.
112 960  = 2 oz.
Cor. sub. 5  grs
Sal. Am. 10  grs
water 2. oz.

MS (MHi); entirely in TJ’s hand; at foot of, and oriented upside-down to, RC of William H. Fitzhugh to TJ, 18 May 1818.

cor. sub.: “corrosive sublimate” (mercuric chloride). sal. am.: “sal ammoniac” (ammonium chloride).

TJ composed this document no earlier than 29 May 1818, when he received the unrelated letter at the bottom of which he jotted these notes. He may have written them in connection with a painful infection on his buttocks contracted that summer at Warm Springs (MB, 2:1346). TJ’s calculations could derive from a recipe for “Itch Lotion” found on p. 312 of James Ewell, The Planter’s and Mariner’s Medical Companion (Philadelphia, 1807; Sowerby, no. 893): “Take of Corrosive sublimate, one drachm; Crude Sal Amoniac, two drachms; Water, one pint and a half. Mix.” A recipe differing only in specifying one quart of water appears on p. 607 of the 5th ed. of Ewell’s work, entitled The Medical Companion (Philadelphia, 1819; Poor, Jefferson’s Library, 5 [no. 183]), a copy of which TJ received from the author late in 1819 (Ewell to TJ, 12 Oct. 1819; TJ to Ewell, 7 Nov. 1819).

Index Entries

  • ammonium chloride (sal ammoniac); medicinal use of search
  • corrosive sublimate (mercuric chloride); medicinal use of search
  • Ewell, James; The Medical Companion search
  • Ewell, James; The Planter’s and Mariner’s Medical Companion search
  • health; rash search
  • health; staphylococcus infection search
  • household articles; sal ammoniac search
  • Jefferson, Thomas; Health; staphylococcus infection search
  • Jefferson, Thomas; Writings; Notes on Itch Lotion search
  • medicine; itch lotion search
  • medicine; pharmaceutical calculations search
  • mercuric chloride (corrosive sublimate); medicinal use of search
  • sal ammoniac (ammonium chloride); medicinal use of search
  • staphylococcus; TJ infected with search
  • The Medical Companion (J. Ewell) search
  • The Planter’s and Mariner’s Medical Companion (J. Ewell) search
  • Warm Springs (Bath Co.); TJ visits search
  • “itch” (rash) search