[SAUNDERs ] EXPERIMENTS IN PLANT BREEDING 123 
Canada and the United States on account of their useful size, produc- 
tiveness and freedom from mildew. 
The crosses in gooseberries include a number of other promising 
sorts. 
Many crosses have been made with red and black raspberries, 
Rubus strigosus with Rubus occidentalis, the progeny of which have 

Fic. 6.—AURORA. 
been purple caps, many of them of large size. The black currant, 
Ribes nigrum has been crossed with the gooseberry Ribes grossularia 
and some interesting results obtained. Crosses have also been effected 
between the sand cherry and the plum Prunus pumila with Prunus 
americana, with Prunus nigra and Prunus americana, Pyrus maulet 
and Pyrus japonica, and between Berberis Thunbergi and Berberis 
vulgaris purpurea. 
A large quantity of most interesting material has thus been accu- 
mulated, among which, no doubt, many new sorts of practical value 
will be found. 
