158 APPENDIX. 
similar to those with petroleum. Strengths used:—1 per cent., 
0:5 per cent., 0°25 per cent., 0-1 per cent., and 0:05 per cent.” 
The above plan of treatment, it will be observed, includes,—speci- 
fication of the nature of the different chemical applications with which 
it is purposed to experiment ; the various strengths at which they are 
to be used; also how often they are to be used; and under what con- 
ditions of the plants. It is also purposed, by microscopic examination of 
contents of the galled buds which have been subjected to treatment, 
to ascertain precisely what the effect of the various applications has 
been in preventing infestation, or destruction of Acarine contents 
where growth has started. 
From these experiments, as well as from such as turn on various 
methods of horticultural treatment of the bushes, it is greatly to be 
hoped that serviceable practical information will be gained, of which 
at present all Black Currant growers stand in great need. 
