ari-anged in the order most often foimd among Angios- 

 penns, (Fi^, 17). The antipodals very early disappear 

 so that they are hard to find at the time of fertili- 

 zation. The endosporm nucleus is found at about the 

 middle of the sac. 



The tissue of the nucellus surrounding the ma- 

 ture embryo-sac is inuch disintegrated (Pig, 17), Around 

 tlie chalazal end of the sac the tissue is alv/ays very 

 deeply staining and there is a quite evident strand of 

 conducting tissue from the tip of the f ibro-vascular 

 bundle at the chalaza to the lower end of the embryo- 

 sac (Fig, 17), The base of the m^collus shows by its 

 smaller cells that it is the most rapidly growing part. 

 The development which the ovule has attained at the 

 beginning of winter is shown in Fig, 18. The integu- 

 ments up to the early part of April are still behind 

 the nucellus in gro>vth. In spring their gi'owth is 

 hastened and thoy soon project beyond the nucellus. 



