130 SULPHURET OF LIME, OR CANTON S PHOSPHORUS.

phenomenon is therefore to be considered analogous to a slowcombustion of the sulphur; the extrication of caloric, duringeach instant of observation, being too inconsiderable to be ap-preciable either by the senses or by the thermometer.

2. SULPHURET OF LIME,

OR

CANTON's PHOSPHORUS.

To prepare this phosphorus, take some oyster shells, calcinethem, by keeping them in a good coal-fire, for about an hour.Then let the purest part of the lime so obtained, be pulverizedand sifted. To three parts of this powder, add one of flowers ofsulphur, mix them well together, put the whole into a cruci-ble, and ram it tightly. Let it then be placed in the middle of afire, where it must be kept red hot for an hour at least, it maythen be removed to cool. When it is cold cut or break the massto pieces. Scrape off the brightest part, which if good, will shinein the dark. This is to be kept in a glass phial, hermeticallysealed.

This is Canton's phosphorus. The quantity of light which alittle of it gives, when brought into a dark room, after it hasbeen exposed for a few minutes to the sun, or even day-light issufficient to shew the hour by a watch, if the eyes have beenpreviously kept shut a minute or two.

Rationale. ..Analogous to the former.

3. NITRATE OF LIME,

OR

BALDWIN'S PHOSPHORUS

Is a combination of nitric acid, with lime, obtained bydissolving carbonate of lime in nitric acid ; and evaporatingthe solution in an earthen vessel to dryness. This solid salt