frwa the Pajle (^Reddle, 503 



I/idicatzon of tbi Suhjlanccs to be ufed, their Quantities^ and 

 what thej will produce. 



L Dry reddle, or red oxyde of iron, i ounce ; gum arabic, 

 dry, 18 grains. — ^Thefe crayons are very tender, but they 

 may be employed for large defigns. As they are the kind 

 in which the leaft gum is ufed, they have not fufficient con.- 

 fiftence for any other purpofe. 



II. Reddle, &:c. I ounce; gum 21 grains. — Strong crayons, 

 a little tender, but excellent for large drawing's. 



III. Reddle I ounce, gum 24 grains, or rather 25'- grains. 

 — ^oft and folid crayons : they are the beft that can be era- 

 ployed for common ufe. 



IV. Reddle i ounce, gum 27 gi-ains. — Crayons rather 

 firm, but not hard ; ufeful for drawings that require delicacy. 



V. Reddle i ounce, gimi 30 grains. — Very firm crayons, 

 proper for drawings in which every ftroke is intended to be 

 given. 



VI. Reddle I ounce, gum 33 grains. — ^Very hard cra.yon3, 

 which cannot be ufed without I'ome force. The largeft quan- 

 tity of gum that can be employed is ufed in their compofi- 

 tion : with more they would be ufelefs. 



VII. Reddle i ounce, gum 22 grains, white hard foap30 

 grains. — ^Thefe crayons have a little browner caft than tlie 

 former; they are of a very good confiftence, and can be eafily 

 cut. All crayons, however, in the compulition of which foap 

 is employed, are attended with this fault, that the ftrokes they 

 make have a fliining appearance if the touches are rej^eated 

 a littlu too ftrongly. No other experiment with foap fuc- 

 cceded. Thefe crayons have a pcrfedt referablance to thofe 

 made by Dcfmarcts. 



VIII.. Reddle i ounce^ ifinglafs 36 grains. — Crayons of 

 ft brilliant colour, and excellent for ufe. If lefs ifinglafs is 

 employed they become brittle j and if more, they are too liard. 



XV. De/crip- 



