| NINE CALENDAR MONTHS. | TEN LUNAR MONTHS. | |||
| From | To | Days. | To | Days. |
| January 1 | September 30 | 273 | October 7 | 280 |
| February 1 | October 31 | 273 | November 7 | 280 |
| March 1 | November 30 | 275 | December 5 | 280 |
| April 1 | December 31 | 275 | January 5 | 280 |
| May 1 | January 31 | 276 | February 4 | 280 |
| June 1 | February 28 | 273 | March 7 | 280 |
| July 1 | March 31 | 274 | April 6 | 280 |
| August 1 | April 30 | 273 | May 7 | 280 |
| September 1 | May 31 | 273 | June 7 | 280 |
| October 1 | June 30 | 273 | July 7 | 280 |
| November 1 | July 31 | 273 | August 7 | 280 |
| December 1 | August 31 | 274 | September 6 | 280 |
The above Obstetric “Ready Reckoner” consists of two columns, one of calendar, the other of lunar months, and may be read as follows: A patient has ceased to menstruate on the first day of July; her confinement may be expected at soonest about the 31st of March (the end of nine calendar months); or at latest, on the 6th of April (the end of ten lunar months). Another has ceased to menstruate on the 20th of January; her confinement may be expected on the 30th of September, plus 20 days (the end of nine calendar months), at soonest; or on the 7th of October, plus 20 days (the end of ten lunar months), at latest.
COMMON NAMES OF CHEMICAL SUBSTANCES.
| COMMON NAMES. | CHEMICAL NAMES. |
| Aqua Fortis | Nitric Acid. |
| Aqua Regia | Nitro-Muriatic Acid. |
| Blue Vitriol | Sulphate of Copper. |
| Cream of Tartar | Bitartrate Potassium. |
| Calomel | Chloride of Mercury. |
| Chalk | Carbonate Calcium. |
| Caustic Potassa | Hydrate Potassium. |
| Chloroform | Chloride of Gormyle. |
| Common Salt | Chloride of Sodium. |
| Copperas, or Green Vitriol | Sulphate of Iron. |
| Corrosive Sublimate | Bi-Chloride of Mercury. |
| Diamond | Pure Carbon. |
| Dry Alum | Sulphate Aluminum and Potassium. |
| Epsom Salts | Sulphate of Magnesia. |
| Ethiops Mineral | Black Sulphide of Mercury. |
| Fire Damp | Light Carburetted Hydrogen. |
| Galena | Sulphide of Lead. |
| Glauber’s-Salt | Sulphate of Sodium. |
| Glucose | Grape Sugar. |
| Goulard Water | Basic Acetate of Lead. |
| Iron Pyrites | Bi-Sulphide Iron. |
| Jeweler’s Putty | Oxide of Tin. |
| King’s Yellow | Sulphide of Arsenic. |
| Laughing Gas | Protoxide of Nitrogen. |
| Lime | Oxide of Calcium. |
| Lunar Caustic | Nitrate of Silver. |
| Mosaic Gold | Bi-Sulphide of Tin. |
| Muriate of Lime | Chloride of Calcium. |
| Nitre of Saltpetre | Nitrate of Potash. |
| Oil of Vitriol | Sulphuric Acid. |
| Potash | Oxide of Potassium. |
| Realgar | Sulphide of Arsenic. |
| Red Lead | Oxide of Lead. |
| Rust of Iron | Oxide of Iron. |
| Salmoniac | Muriate of Ammonia. |
| Salt of Tartar | Carbonate of Potassa. |
| Slacked Lime | Hydrate Calcium. |
| Soda | Oxide of Sodium. |
| Spirits of Hartshorn | Ammonia. |
| Spirit of Salt | Hydrochloric or Muriatic Acid. |
| Stucco, or Plaster of Paris | Sulphate of Lime. |
| Sugar of Lead | Acetate of Lead. |
| Verdigris | Basic Acetate of Copper. |
| Vermillion | Sulphide of Mercury. |
| Vinegar | Acetic Acid (Diluted). |
| Volatile Alkali | Ammonia. |
| Water | Oxide of Hydrogen. |
| White Precipitate | Ammoniated Mercury. |
| White Vitriol | Sulphate of Zinc. |
Proprietary and Elegant Preparations.
MEDICATED PADS.
Medicated pads are quite popular with many who have tried them, and a multitude of remarkable cures are attributed to their use. We here present formulas equal to the best, and as they are quite simple to prepare they can now be tried with but little expense: