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 lO-centimeter sieve was 

 employed to take out bulbs, which were planted 11 to the row. 



