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THE CHAIRMAN: You will all be pleased to know that 

 Governor Tener very willingly accepted an invitation to come in 

 and say a few words this afternoon before our final adjourn- 

 ment. 



This morning, after considerable labor, we formulated some 

 rules to govern a discussion that never occurred. It occurs to 

 the Chairman that it might be well to open up the subjects of 

 the morning session, in connection with the one subject pre- 

 sented this afternoon, under the rule adopted this morning and 

 continue along that line until the Committee on Resolutions is 

 ready to report. If no objection to that proposal is made, it will 

 be understood that it is the wish of the Conference so to pro- 

 ceed, having the paper presented by Dr. Hopkins and the papers 

 presented before us this morning for discussion on a three- 

 minute rule. 



DR. MICKLEBOROUGH, of Brooklyn : Mr. Chairman and 

 Gentlemen : I have given some four years of study, more or less, 

 to this fungous disease causing the death of the chestnut trees. 

 A great many of you have seen the pamphlet which I wrote for 

 the State of Pennsylvania. I am indebted for my first knowl- 

 edge of this subject to the gentlemen just in front of me, Dr. 

 Murrill, of New York. My attention in 1907 was called to it in 

 Forest Park in Brooklyn. Let me say a word or two to those 

 who are using the microscope. I think perhaps one or two errors 

 may have been stated here, and I want to call attention to the 

 spores that are developed by this fungus, the Diaporthe para- 

 sitica. 



This fungus produces four kinds of spores. TTie two most 

 abundant and generally found are the sac spores in the winter 

 stage and those other spores in thread masses called conidial 

 spores, and which are present in the summer stage. Besides these 

 there will be found in some specimens, numerous small spores 

 (or cells) which are developed in a flask or perithecium called 

 a spermagonium. These very minute spores (or cells) of the 

 spermagonium are called spermatia. Besides being very small 

 they possess great motility. There is a fourth kind also de- 

 veloped in a flask or perithecium which is called a pycnidium. 



