186 PEINCIPLES OF GARDENING. [CH. VI. 



Their organization closely resembles that of the 

 branch by which they are borne, and they are only 

 its parts taking other fonns. Tracing, says the 

 late Mr. Ivnight, the progress of the organization in 

 the full grown finiits of the apple and pear, I found, 

 as Linnaeus has described, that the medulla, or 

 pith, appeared to end in the pistils. The central 

 vessels diverged round the core, and approaching 

 each other again in the eye of the fniit, seemed to 

 end in ten points at the base of the stamens, to 

 which I believe they give existence. The spiral 

 tubes, which are, in all other parts, appendages to 

 these vessels, I could not trace beyond the com- 

 mencement of the core ; but as the vessels them- 

 selves extend through the whole fruit, it is probable 

 that the spiral tubes may have escaped my observation. 



xUthough the medulla is traced to the base of the 

 pistils, the central vessels to the part enveloping 

 the seed, and to the stamens, and the spiral ves- 

 sels tlu'oughout the fniit, yet over eveiy part is 

 extended the parenchyma and epidermis, and the 

 sap circulates through the entii'e of the flower and 

 fmit — ascending, being elaborated, and descending — 

 as regularly as through other parts of the plant. 

 Coloured infusions may be traced through the ves- 

 sels in the stem to the fmit, and if a ligature be 

 passed round a peach or an apple, the enlargement 

 is greatest above, that is between the ligature and 



