412 HARPER— ORGANIZATION, REPRODUCTION 



each, we might be able to give a fixed value to this relation between 

 the inequality of the diameter's and the inequality of the angles 

 about e and to get some notion of the viscosity of the protoplasm, 

 the adhesion of the cells to each other, etc. As noted, hozuever, it 

 is obvious that the inequality of the diameter may exist in some 

 degree at least in approximately free cells, as is shown in figures 



29-33- 



In the basal included angles of cells 7, 8, 9, 10, etc., of series III., 

 we have two series consisting of five pairs each placed symmet- 

 rically right and left of the axis mn of the colony, as in the case of 

 the corresponding angles, about gg^, etc., and ee'^, etc. The value 

 of each of these angles for each of the seven colonies is given in 

 Table IV. The averages arranged as two sets of corresponding 

 right and left pairs are given in Table V., section 6. The agree- 

 ment in the values of the averages of these sets is rather close, the 

 range being from 123°, the smallest, to 127°, the largest. It seems 

 probable that in the type configuration determined by surface ten- 

 sion and the inherited shape of the cells these angles tend to be 

 equal. The average for the different sets is : 



In the selected type diagram derived from the selected colony, 

 No. 55, the average for these angles is 127°. The colony No. 55 

 is, however, especially irregular in the region of cell four, and an 

 arbitrary value, 131°, was assigned to the two angles o*d*r^ and 

 o^d^r^. If the measured value for these two angles, 123°, is taken 

 instead of the arbitrary value, the average of these angles for the 

 single selected colony. No. 55, becomes 126°, only 1° different from 

 that for the series. 



On the whole, the values for the included angles of the cells 

 agree fairly well when derived by averaging the corresponding 



