82 BOTANICAL GAZETTE . [auGust 
of measurement in the first half. Measurements were made of 
rather a broad strip across the partition wall to avoid error in 
the computations through very large or very small cells occa- 
sionally found. The individual cells in such a strip were care- 
fully measured by the usual method of measuring spores of 
fungi, an eyepiece micrometer being employed in the work. The 
measurements are given in detail at the close of this paper in 
Exps. 6-9, where the several sets of measurements of corre- 
sponding parts of the two halves of each specimen are arranged 
in parallel columns for convenience of comparison. The general 
results of these experiments are as follows: 
In £xp. 6 the measurements were made on half of a stipe just 
beginning elongation and on the other half after its completion. 
The averages of the diameters in the several sets of measure- 
ments of the unelongated half vary from 26.74 to 35.3, with a 
general average of 30.5 computed on all the measurements. 
The corresponding averages of the other half after its elongation 
vary from 32m to 40.5m, with a general average of 37.14 based 
on all the measurements. These results give an average increase 
of 22 per cent. in length of diameter of the cells of pseudopar- 
enchyma during elongation of the receptaculum. 
Exp. 7 was made with a fine large plant having its receptacu- 
lum already partially elongated. The averages of the sets of 
measurements of pseudoparenchyma from the partially elongated 
receptaculum vary from 28.5 to 37.2 with a general average 
of 31.3“ based on all the measurements. The corresponding 
averages of the other half, after the completion of its elongation, 
vary from 36.6 to 39 with a general average of 37.9 com- 
puted from all the measurements. These results show an 
increase of 21 per cent. in length of diameter of the cells of 
pseudoparenchyma during the completion of elongation of the 
receptaculum. 
In £2. 8, also made with a plant partially elongated at the 
beginning of the experiment, the average lengths of diameter of 
the pseudoparenchyma vary in the partially elongated half from 
25.5m@ to 32.2m with an average of 28.54 determined from all the 
