MATERIALS 47 



This emulsion, also, may be made of about ten times 

 the strength required for use, emulsifying the soap and 

 oil with half a gallon of water only, and adding the 

 further nine gallons to it subsequently. 



Another method of making emulsions with soap is 

 by means of what is known as Soluble Parajfi)i or 

 Paraffiji Jelly. When soap, with a little water added to 

 it, is heated, and mixed up with paraffin oil, a nearly 

 clear liquid is obtained, which forms a jelly on cool- 

 ing. As much as eight or nine volumes of paraffin 

 can thus be incorporated with one volume of soap. 

 When the "soluble paraffin" thus obtained is mixed 

 with water, it forms an emulsion similar to that 

 produced by churning the oil with a soap solution, as 

 described above. One of the formula; most in use 

 for making paraffin jelly is : Paraffin, 5 gallons ; soft 

 soap, 8 lbs. ; water, i pint. 



A certain amount of naphthalene can be incorpor- 

 ated with such a mixture, and a product of this nature 

 has received the name of Paranaph. The instructions 

 for makinGf it are — 



Heat the soap and water together till the former is 

 quite dissolved, stir into this the naphthalene, and, 

 after removing the vessel from the fire, add the paraffin, 

 and stir till the whole is incorporated. P'or use, one 

 part by weight of the mixture should be diluted with 

 100 to 200 parts of soft water. 



