50 



Prof. Waugh also used the mosquito netting in his work 

 with plums. His records show no variation from those 

 obtained where paper bags were used, except in the ease of 

 the Cumberland which set two fruits, and these he maintains 

 were the result of insects as some of the blossoms were found 

 pressed closely against the netting. 



Prof. Waugh also prepared glass plates 1x3 inches by 

 smearing one side with vaseline. These were exposed in the 

 plum orchard and later a count made of the pollen collected. 

 The first column in the table designates the glass plate, the 

 second the distance from a tree in full bloom, the third its 

 position and height from the ground, H meaning the plate 

 had a horizontal position and V that it was vertical to the 

 tree and facing the wind, the fourth the length of exposure 

 and fifth the amount of pollen both as single grains and as 

 masses. 



WIND AS AN AGENT IN CROSS-POIiLINATION. 

 Vt. Exp. Sta. 1900. 



Distance Position Time of Amt. of pollen 



Plate No. from tree and height exposure grain, mass. 



Most of the pollen found on the plates was in the form 

 of masses rather than single grains. This shows its sticky, 

 doughy nature, also its non-adaptability to being carried by 

 the wind. 



Prof. Lewis repeated this experiment in his work with 

 apples with results as shown in table below. 



WIND AS AN AGENT IN CROSS-POLLINATION. 

 Ore. Exp. Sta. 1908. 



No. Pollen grains 

 Slide No. Dist. from tree Height of slide after 24 hlours 



