MICHIGAN ACADEMY OF SCIENCE. 



345 



PICEA EXCELSA NO. III. 



PICEA EXCELSA NO. IV. 



Picea excelsa tap root lengths, as indicated by the preceding theoretical 

 curves would, at 10-day intervals, be as follows: 



I. 



June 28 1.5 



July 8 1.8 



July 18 2.2 



July 28 2.6 



August 7 3.0 



August 17 3.3 



August 27 3.7 



September 6 4.1 



September 16 4.4 



September 26 4.8 



cm. 



PINUS RESINOSA. 



The seeds of Pinus resinosa were planted in the spring of 1916 

 (April 27). Owing to the ravages of a damping off fungus, the seedlings 



