selection of the numerous varieties of Orange, Lime, and 
Lemon which they have long cultivated with such great 
success, and to them I owe the flowering specimen and 
fruit of the Bijou Lime here represented. Mr. T. F. Rivers, 
to whom I applied to be informed of its origin, tells me 
that it was received from St. Michael’s (Azores) many 
years ago, with other sorts of Oranges and Lemons, but 
with no special history attached to it. J may here add in 
respect of this interesting class of plants that Mr. Rivers 
finds that the bitter Orange will not hybridize with the 
sweet, nor the Limes and Lemons with the Orange; and 
that the produce of the attempts to cross the Tangerine 
with the St. Michael’s has shown no sign of variation in 
the foliage, though now eight or ten years old. No fruit, 
however, has in this case yet been borne, for seedling 
oranges require about twenty years to develope into fruit- 
fulness. On the other hand, Darwin (Cross and Self- 
Fertilization of Plants, p. 394) says that he has collected 
evidence on the natural crossing of varieties of the orange, 
and cites the authority of Gallesio for the fact. 
Fig. 1, Portion of leaf; 2, flower with corolla removed ; 3 and 4, stamens; 5, 
portion of cortex of fruit; 6, young seed :—all enlarged. 
