CASEIN PAINTS. 65 



not only look like stone, but behave as though actually 

 petrified : 



One part of English Roman cement is stirred up with 

 2 of washed scouring sand, 1 part of fresh curd and part 

 of skim milk, no more being made ready at a time than can 

 be used up in an hour. While the mass is being applied, it 

 must be kept continually stirred by an assistant in order to 

 prevent the sand from settling to the bottom. The coating 

 is laid on as thin and smoothly as possible, and as soon as 

 dry is followed by a second. In summer it dries quickly and 

 sets as hard as stone. Finally, woodwork that is to stand 

 upright is coated with a mixture of boiled oil and an earthy 

 pigment, a double coating being applied to sloping wood- 

 work, and 3 to 4 on horizontal or exposed work that is liable 

 to be trodden on. 



For smoothly planed woodwork, Hausler used the sub- 

 joined mixture with equal success : English Roman cement, 

 2 parts ; fresh curd, 1 part ; buttermilk, f part ; the whole 

 being well stirred together and made up in only sufficient 

 quantity to last for a short time. The Roman cement must 

 not be at all stale. 



