A. H. Lkks 353 



produced no improvement; if anything it was inferior to plain lime 

 wash. This is not surprising as calcium silicate, which is formed 

 by the action of lime on sodium silicate, is a hard brittle body and not 

 likely to give adhesiveness in the quantity used above. Greater 

 strengths would prove too expensive. The addition of salt, according 

 to the following formula : 



Lime Salt Water 



20 2 100 



gave the same negative result. 



It having been brought to the author's notice that tallow was used 

 by many firms who did outside lime washing, the following was tried, 

 the tallow being added as the lime was slaking: 



Lime Tallow Water 



50 2 250 



This formula proved of doubtful value. 



Field experiments. 



The lime and tallow wash was tried at five different centres in 

 counties within the advisory area of the Bristol University Research 

 Station, the lime and salt at eight and the whiting and size at three. 

 Control experiments were also done at Long Ashton. 



The whiting and size formula gave very good results but as a practical 

 wash it is far too expensive. 



Lime and tallow showed no superiority over lime and salt. Some- 

 times one gave a better result and sometimes the other, and it was 

 clear that good sticking power depended more on the freshness of the 

 lime than on any other factor. 



Season 1913-14. 

 Laboratory experiments. 



The whiting and size wash, though giving a good coat, proved 

 far too expensive. Less quantities of size than that used above gave 

 too thin a coating. 



Accordingly an attempt was made to obtain a cheaper form of glue. 

 After some trial one was obtained at about Ad. a lb. in hundredweight 

 quantities. This brought down the cost to about M. a gallon which 

 was still prohibitive. It was found that smaller quantities of glue 



