﻿Contr. towarcl the Embryol. and Anat. of Pol. pallipes (Hymenopt). 133 



Heymons (26) for Forficula where, after the two groups of nuclei 

 have been fornied, the inner group, yolk nuclei, are nearly all resting, 

 the outer group, cleavage nuclei dividing. 



Each nucleus, in any of the stages of development already 

 described, is surrounded by a mass of cytoplasm the amount of 

 which varies but little around the different nuclei. This mass of 

 cytoplasm is amoeboid in shape, the pseudopod-like processes extend- 

 ing for varying distances, some anastomosing with similar processes 

 from neighboring nuclei. Each nucleus with its surrounding cyto- 

 plasm is in this way connected with several of those near it, there 

 presumedly being a connection between the great part, if not all, of 

 the nuclei within the egg. To what degree this connection extends we 

 are unable to say, it being impossible to follow the fine connecting 

 Strands to any great distance between the yolk globules. Any stage 

 of pre-blastodermic development will by careful search reveal some of 

 the nuclei connected in this way (Figs. 11 and 12). Upon entrance 

 of the cleavage nuclei and their surrounding cytoplasm these 

 connections are undoubtedly lost; even at a stage just before this 

 the Strands could not be seen, although we incline to the belief that 

 the connection remains until the Keimhau tblastem is reached. Even 

 after the cleavage nuclei have entered the Keimhautblastem connect- 

 ing Strands can still be seen joining the cytoplasm of the yolk nuclei 

 which have remained within the egg. These, the yolk nuclei and 

 surrounding cytoplasm, later fuse with each other, forming large 

 multinucleate masses, from which connecting Strands have disappeared. 



A resting nucleus (Figs. 8, 9 and 10), taken from either cleavage 

 or the yolk group, contains a number of fairly large chromatin 

 granules of various sizes and without any definite shape. These 

 granules do not show any regulär arrangement within the nucleus 

 other than that most appear restricted to the peripheral part: each 

 granule is enclosed in the net-like Strands of a reticulum. They are 

 often collected in small groups and around each group the network 

 gathers more abundantly than around a Single granule. This network, 

 besides surrounding the granules, or groups of the same, connects 

 them with each other, passing from one to another in narrow fibrils 

 or more commonly as wide Strands of varying thickness. We were 

 unable to distinguish a nucleole, as such, within the nuclei. An 

 examination of individual nuclei often led to the belief that a nucleole 

 was present, but, what we at first considered a nucleole, did not 

 appear constantly in any number of nuclei. We were unable to see 



