PRODUCTION OF TULIP BULBS. 43 
The numbers heading the five columns already mentioned govern 
quite definitely, except where noted, the size of bulb planted; but the 
method of sizing needs elucidation here in order to completely under- 
stand the reproduction and propagation. 
The methods used in sizing were quite uniform. It will be noted 
that but few elevens were planted in 1919. This means that mer- 
chantable stock was not as a rule put back in the ground. In the 
sizing the conventional nesting sieves were used. Sieves of 8, 7, and 
5 centimeters were nested in a hand shaker, as shown in Plate XV, 
Figure 1. Those bulbs caught by the 8-centimeter sieve were planted 
14 to the 3-foot row, those by the 7-centimeter sieve 21 to the row, 
and those by the 5-centimeter sieve 35 to the row. The smallest 
size which passed the 5-centimeter openings in the last sieve was 
planted 50 to the row. In a few cases a 10-centimeter sieve was 
employed to take out bulbs, which were planted 11 to the row. 
