EXERCISE XXXIII 



THE STUDY OF GRAFTING- WAXES 



Material. Resin, beeswax, rendered beef tallow, raw linseed 

 oil, white resin, alcohol, turpentine, Burgundy pitch, red ocher, 

 white pitch, Venetian red, No. 16 white knitting-cotton. 



Apparatus. Granite kettle, small pail, cooking-burner. 



Grafting-waxes are used for the protection of wounds and for 

 the covering of wounded surfaces when certain kinds of grafts 

 are made. Grafting-waxes are made by the following methods : 



BEESWAX AND RESIN WAXES 



Formula 1. Weigh out one pound of resin, one half of a pound 

 of beeswax, and one fourth of a pound of rendered beef tallow. 

 Place the ingredients in a granite or an iron kettle and allow 

 them to melt, then boil for about one minute, or until the mass 

 is thoroughly mixed. Remove from the fire, and pour the melted 

 mass directly into a pail of cold water. When the mass is cold 

 enough to handle, gather it into a ball and work it with the 

 hands until it assumes a light-brown color. Grease the hands 

 thoroughly with tallow before working, to prevent the wax from 

 sticking to them. Why is the melted wax poured into the water ? 

 What is the purpose of the molding and working with the 

 hands ? It is important that pure beeswax be used and not wax 

 which has been adulterated with paraffin. Why ? Does the wax 

 aid in the healing of a wound ? Discuss. 



Formula 2. Weigh out one pound of resin, one fourth of a 

 pound of beeswax, one fourth of a pint of raw linseed oil. Place 

 the ingredients in a granite kettle and allow them to melt 

 gradually. When the mass is thoroughly melted and incorpo- 

 rated, pour it into a bucket containing cold water, and treat 

 as above. After twenty-four hours examine both batches and 

 describe fully the differences, if any. Explain. 



G-rafting-cord. Often in the making of root grafts and oc- 

 casionally in budding, grafting-cord is needed. This is made 



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