CONTRIBUTIONS FROM THE WISLEY LABORATORY. 1 3 
Similarly, any of the first five varieties on the chart would be of 
little use planted as cross-pollinizers for 'Royal Jubilee/ or vice 
versa. 
From the previous list already referred to, giving the flowering 
period of a great number of varieties, similar calculations should be 
made. In using" it as a guide in choosing varieties suitable for planting 
together, the number of days at which any variety may be expected 
to come into flower in relation to any other is given, and if the 
effective flowering period is reckoned at two days before and seven 
days after full bloom (to allow for possible variations in time of 
flowering, unfavourable weather at flowering time, and the like), 
O f X 
3 V- J" 
f> y g 9 to '/ 
/X <3 "f- IS 'i> t°T tS /Q IO X/ XX 
IRtSH PEACH. 
— X- 
WafWEX'S fVfiG. 
— X- 
STIRLING CASTLE. 

BERUT-iorMTH. 
_x 
COXS OWN CE PIPPIN. 
- x- — 
\NORC£STER PEAKHEHrt. 
—X— 
BfflriLEVS SEEOUffC. 
CMES PRINCE BL6EPT 
X 
irEwrosv worroEK. 
-X 
ROWL TV6/LEE. 
— x 
varieties in which overlapping of blossoming occurs during the 
period may be safely interplanted. 
It is inadvisable to plant larger blocks of any one variety than four 
rows, without a row of another variety to provide pollen, since in larger 
blocks than this it is possible that the centre trees may be insufficiently 
cross-pollinated, especially if high winds prevail during the time of 
flowering, when wild insects and bees prefer to confine their attentions 
to small areas. 
Wind plays no part in the transfer of pollen from tree to tree, so 
that the assertion sometimes made that varieties to be planted as 
" pollen providers " should be placed on the windward side, in order 
that pollen may be carried on to the main varieties, is incorrect. 
In plantations or orchards where efficient means for the cross- 
pollination of the blossoms do not at present exist, a useful method 
of supplying the deficiency is by the top-working of trees in every 
fourth row or so, with scions from a variety, or varieties, capable of 
effecting the desired purpose. 
