68 



CARNEGIE INSTITUTION OF WASHINGTON. 



fruit being taken as a globe. The relation of the two sets of measurements 

 is to be seen by comparison of the data in section A of the table. 



The rate on September 11 by du-ect measurement would appear to 

 be one-tenth that of a month earlier, yet actually water and new 

 material were being added at a rate equivalent to one-fourth of the 

 earlier rate. The radial proportions would make the rate on August 21 

 not much more than 40 per cent of the rate on August 9, while the 

 increase in volume was over 96 per cent. The rate in the week begin- 

 ning August 28 would appear to be less than a fourth that by direct 

 measurement on August 9, yet actually the increment of water and 

 material is more than half that in the younger stage and smaller size. 



A second fruit, with the auxograph bearing arranged to take axial 

 variations in the fruits which measured 33 mm., was arranged to run 

 concurrently with the above and under identical temperature and 

 conditions of moisture. The daily rates of increase in diameter were 

 as shown in section B of the table. 



During the first three weeks the rate of increase in diameter lessened, 

 while the actual accretion increased during this time. During the last 

 two weeks the increase in diameter was the same, but the accretions 

 increased. 



The daily rate of increase of a third fruit was as shown in section C 

 of the table. 



The actual volume of this fruit at the close of the experiment was 

 approximately 22,000 cu. mm. and its growth had been followed for a 

 period of 40 days. It is notable that in the earlier stage, in the advance 

 of the fruit from 20 to 26 mm. in diameter, while the increase of the 

 diameter seems constant, the actual accession of material is very 

 much greater. Then in further development the average increment 

 to the diameter was smaller, yet the actual accession of material was 

 greater. Following this, the rate falhng from 0.8 to 0.3 mm. daily, 

 the accession decreases less than half. 



