STATE HORTICULTURAL SOCIETY. 



99 



during a greater part of the season of the tree's growth. I make the qualifications, 

 viz: "The greater part of the season, because there is a part of each year in which 

 the cellular growth of trees is, except under peculiar conditions, wholly confined to 

 the roots, to the leaves and to the fruits. ' ' 



To return then. The cell which I couimenced to describe is a wood cell. See 

 figure No. 1. In our sketcli it appears as do all newly forming wood cells before they 

 have been suiTounded and pressed upon by other cells. In the central part of this 

 new cell appears an oval, composed apparently of the same mucilaginous substance as 

 Is the cell itself, but so much thicker than other parts as to be distinctly seen , its 

 thicker filaments radiating as spray, and around the central part, the whole of the 

 interior substance of the cell being enclosed in a delicate membrane or covering. 



I will now come to the second class: those that cause blight in pear, apple and 

 quince trees. The figures No. 2 to 6 illustrate these. No. 2 and 3 mature blight cells 

 or plants. No. 4, cell in process of growth, with germ just visible at the end; 5 and 6, 

 germs of the same of smaller growth . 



These cells are found interspersed among the new wood cells. Many of them have 

 one of their ends attached to other similar little cells which are but just discernible in 

 the pores and seams of the bark . 



These last mentioned cells are perfect fac similes of the wood cells but varying 

 greatly in size, and difi'ering in their internal structure, in so far that their rayed 

 nucleus is surrounded with small rayed or sprayed lines. These lines seem to emanate 

 from the base, or end of the cell that is or was attached to another cell. These 



