APPENDIX 11. 211 



Table 6.— Silicate of soda. 



Table- 6 gives the results of a single experiment in which silicate of soda, in the 

 form of a thick liquid, was diluted ten times and applied in fine spray. 



In other trials, with stronger solutions, the best result obtained was 80 per cent, 

 of the young Coccids killed, and trees were cleared of scale by repeated api)lication8 

 at intervals of several weeks ; but in these cases the bark was hardened and the 

 growth of the trees somewhat checked. 



