Growth Integration 



101 



coast redwood, Sequoia semperrirens (figure 61), where the 

 new segment is short, is added end on to the one before it 

 until a considerable succession of segments is produced, and 

 where the leaves are retained for several years. That each 

 segment in these leaves is an annual production is not cer- 

 tain, probably several segments being sometimes formed in a 



FIGURE 61. SEQUOIA SEMPERVTREXS. 



single season ; but however that may be, that growth occurs 

 in a series of impulses, each of which is sharply recorded 

 in the size gradations of the repeated parts, is obvious 

 enough. 



It is a familiar fact, too, that in many plants a similar 

 quantitative gradation of the reproductive parts along an 

 axis occurs, but the extent to which this scheme pervades 

 the constituents of the members of the series, even to the 

 seeds, appears not to have attracted much interest on the 

 part of botanists. To illustrate this point I present a single 

 set of measurements, one of many which I have collected, 



