14 N. H. Agr. Experiment Station [Bulletin 304 



the stack of Type No. 4 crates was due to better dissipation of this heat 

 by air circulation through the vertical channels previously described. 



At this point the fruit was removed to the blower room and stacked 

 with the long axis of the boxes crossways of the room. In this position 

 it was believed that the air would move from the space at the rear of the 

 pile, through the crosswise channels previously described, and thus to 

 the blower unit. Tests with lighted tapers indicated that this was in- 

 deed the case. 



The Style 4 box maintained the slightly lower temperature at which 

 it was placed in storage, but gave no evidence of superior air circula- 

 tion under the conditions prevailing in this room. 



It may be concluded that with forced draft air circulation, ventilation 

 is adequate in the Style 5 crate. The experience in the receiving room 

 seems to indicate that in rooms with gravity air circulation the Style 4 

 would have an advantage. 



Three lots of Mcintosh apples picked at the usual time were stored 

 respectively at 30°, 32° and 38° F. Those stored at 30° temperature 

 kept longest and had least spoilage in storage, but never did develop a 

 characteristic flavor. Their flavor at all tests was characteristic of im- 

 maturity and they were decidedly lacking in the Mcintosh aroma. 

 Those stored at 32° kept over a long period of time and developed fairly 

 good flavor, although they tasted somewhat immature. Those stored at 

 38° reached a fine flavor quickly but were short lived. Apparently, this 

 temperature is too high to store Mcintosh except for an early market 

 as for instance before Christmas. These results bear out those of E. J. 

 Rasmussen and support his conclusion that it is not feasible to store 

 Mcintosh at a temperature lower than 32° F. Five years' studies of 

 storage of apples under varying temperatures and conditions were re- 

 ported during the year in Technical Bulletin 67. {PurneU Fund) 



Apple Pollination Studies 



Reciprocal pollination of Cortland and Early Mcintosh made during 

 the year have shown that the two varieties are cross-unfruitful. 



Work was also begun to test varieties other than Mcintosh for their 

 response to the pollination of only one pistil per flower. Results with 

 Cortland indicated that it behaves like Mcintosh in this respect, there 

 being slightly fewer seeds and more empty cavities and a few more lop- 

 sided fruits than when all pistils are pollinated. With King it was 

 found that the effect was even more pronounced. 



The pollination of only one pistil in the flower may give nearly as 

 good a set of fruit as when all five are pollinated, indicating that in 

 other varieties besides Mcintosh, pollen tubes may travel from a single 

 pistil to various carpels of the fruit. However, with King and Cortland 

 in 1937, as with Mcintosh in previous years, there seems to be on the 

 average one cavity in each fruit without any seed. 



A study was also begun of the effect of the removal of petals or of 

 stamens or both on set of fruit when the flowers were left to open pollina- 

 tion. In the ease of King removal of stamens alone did not seem to 

 affect the amount of fruit set. With Winter Banana only a third as 

 much fruit set as when the flowers remained intact and with Golden 



