64 



My plea then is for exact science in all the public 

 schools. Let our boys and girls have a thorough edu- 

 cation in science, even if they have to dispense with 

 Latin and Greek and ancient history. Science rather 

 than Latin is the basis of the professions and any 

 young man and woman who understands the natural 

 sciences will make a success of his vocation, no 

 matter what it may chance to be. Commerce, manu- 

 factures, agriculture, trades and labor of all kinds 

 would be advanced in value a thousand fold, if men 

 understood the laws which govern them. 



THE DEVELOPMENT OF THE MICROSPORANGIA 

 OF HEMEROCALLIS PLUVA. 



By Edward L. Fullmek. 



NoTF, : This ])aijcr was illustrated by a iminber of original drawiiij>s. 



A cross section of a very young stamen at the point 

 where the microsporangia are to be formed, shows only 

 a rectangular area, which consists of epidermal and 

 general tissue cells. By the rapid grow^th of the 

 microsporangia this area soon becomes somewhat heart 

 shaped. Three or four hypodermal cells of each sjjor- 

 angium become differentiated as the archesporial cells. 

 * he cells of the archesporium divide by periclinal 

 divisions, giving rise to the primary sporogenous cells 

 and the primary tapetai layer. The cells of the 



