608 



THE FORMS OF TISSUES 



[CH. 



eight cells), we see that, in type j, two cells are each in contact with 

 two others, two with three others, and four each with four other 

 cells; in type /, four cells are each in contact with two, two with 



4 



Fig. 258. Aggregations of oil-drops. After Roux. 

 Nos. 5, 6 represent successive changes in a single system. 



four and two with five; and in type i, two are in contact with two, 

 four with three and one with no less than seven. And if we sum 

 up, irrespective of sign, the differences from the mean in these three 

 cases, the sum amounts in / to 6, in i to 7-5, and in / to no less than 



10. We might expect to find in such arrangements, that the com- 

 monest and most stable types were those in which the cell-contacts 

 were most evenly distributed, and the fact that j is (according to 

 Martin Adamson's results) one of the commonest, and I one of the 



