Reproduction. 



77 



of growth of about 14.4 mm. in stem-length (epicotyl) , aside from the small 

 secondary branches. With few exceptions, the seedlings of a month pre- 

 vious (August 8) were very small, as indicated in the table, but neverthe- 

 less the size attained by them, judging from experience in their culture, 

 must have been the result of at least six weeks' growth. 



This was not the close of the growing-season, but I was fortunately 

 able to complement the above data by measurements of seedlings, already 

 mentioned in other connections, which had passed completely through 

 the growing-season of 1908 and been collected 1 in April 1909, in a state 

 of dormancy. The measurements of 311 seedlings were made by caliper. 



Tables 29 and 30 give the data for two quadrats; a third, having 281 

 seedlings, 4 of which are seen in plate 17, fig. A, is not given in detail. 



Combining the averages obtained from tables 29 and 30 with the data 

 for Station 3, quadrat 4, obtained at the same time as those of Station 2, 

 quadrat 7, we obtain table 31. 



Table 29. Growth of seedlings which germinated about June 1, 1908, and examined 

 April 2, 1909. Station 3. All within 100 square meters. 



23 seedlings; average length of main stem, excluding Nos. 22 and 23, which are 

 not normal, 7.65 mm.; average diameter of main stem at base, 2 mm. 



N.B. The exact age of the above seedlings does not exceed 10 months. Of this 

 period, 6\ months were without rain, beginning with the middle of September. All 

 the seedlings were alive at the time of collection. 



1 In company with Mr. G. E. Pell, of New York. 



