Summer.

Winter.

Per cent.

Per cent.

Tallow

18.3

223

Palm-oil

12.2

12.2

Sperm-oil

1.5

1.2

Soda crystals

5.5

5.0

Water

62.5

59.3

100.0

100.0

The "waggon-grease" is thus prepared;-A good milk of lime is made, and run through several overflow-tubs, where all grit is deposited; it is then drained on canvas. If the grease is to be made without water, the paste must be agitated with rosin-spirit, which expels the water, and it is then thinned with a further quantity of rosin-spirit The aqueous milk of lime, or the mixture, of lime and rosin-spirit,.is then stirred, together with a suitable quantity of rosin-oil, in a tight barrel furnished with a shaft and stirrers, without the application of heat, after which the whole is run out into barrels to set. Many other ingredients are often stirred ill, such as "dead oil," petroleum residues, graphite, sea-weed jelly, silicate of soda, oil refiners' foots,- micaceous ores,-steatite, Irish-moss, etc (Spons' Encyclopcedia.)

See-also the article "Friction" in Spons' Dictionary of Engineering, and •"Lubricants " in Workshop Receipts.