This is a wonderful wood thermometer advertising "Dr. Dewitt's - Liver, Blood and Kidney Cure - Price $1.00 Per Bottle".  The thermometer measures 21" in length by 4 7/8" across.  The thermometer is also marked along the side "For Brights Disease, Diabetes, Inflamation of the Bladder, Jaundice, Malaria, General Debility Pains Under the Shoulder Blades, Back and Sides, Female Weakness, And All Diseases Arising From Derangement of Kidneys and Liver, Also Syphilis and Scrofula.".  And at the the bottom it states "Dr. DeWitt's Eclectic Cure - An Internal and External Remedy for Cholera, Cholera Morbus, Dyspepsia, Diarrhea, Rheumatism, Neuralgia, Headache, Diphtheria, Bruises Etc., Etc.".  Basically, if you have it, this will cure it!!!!  Condition is very good to excellent with some minor wear.  A great advertising piece.