248 



PENNYPACKER— ON THE BEACH PLUM 



During the early stages of growth, the young fruit is subject to a 

 fungus attack by Exoascus Pruni (Plum pocket). This is the same 

 fungus that attacks our cultivated plum and which has been fully de- 

 scribed by De Bary and Duggar. 



Fruit Weight: — It is possible under this head to give statistics which 

 will emphasize genetic peculiarities and with which I was able to correlate 

 varietal characters in the leaf and flowers. 



VARIETY 



Large Blue 



Small Blue (1).... 

 (2).... 



Large Purple 



Small Purple (1) 

 (2) 



Large Red 



Small Red 



Large YeUow 



Small Yellow 



WEIGHT or 



FRUIT 



3.61 

 1.74 

 1.29 

 3.52 

 1.40 

 .55 

 2.82 

 1.71 

 2.92 

 1.70 



grams 



WEIGHT OF 

 STONE 



.54 grams 



.22 



.18 



.43 



.22 



.18 



.40 " 



.28 



.40 " 



.22 



WEIGHT OF 

 FLESH 



3.17 grams 

 1.52 

 1.11 

 3.09 

 1.18 

 .37 

 2.42 

 1.43 

 2.52 

 1.48 



PEE CENT OF 

 FLESH 



88 

 87 



86 



86.5 



84 



67 



86 



84 



86 



87 



These variations in weight are very constant for each variety. The 

 weights were obtained by weighing 10 plums and then estimating the 

 average. The per cent of flesh ranges from 84 to 88 per cent with the 

 exception of the small purple late variety which does not ripen until 

 October. The table shows that the stone has attained nearly its fuU 

 size and weight while the flesh development is quite scanty, owing to 

 the lateness of its maturity. 



Stone Variation: — By way of comparison the stone variation is given 

 and seems to markedly correspond with the variation as shown above 

 in the size and weight of the fruits. 



