189 



THE CHAIRMAN: V«m will :ill l»c pl.-Mscd to know tliat 

 (iovernor Teiier very williiij^ly accepted an invitation to come in 

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

 ment. 



This morning, after considerable labor, w'e formulated some 

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

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

 the morning sessiou, in connect i<»ii with the one subject pre- 

 sented this aftcniooiu 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 jjroposal is made, it will 

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

 cee<l, having the paper presented by Dr. Hopkins and the papers 

 presented before us this niorniiig for discussion on a three- 

 minute rule. 



DR. MICKLEKOROUOH, of lirooklyn : Mr. Chairman and 

 Centlemen : 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. 'Six attention in 1907 was called to it in 

 Forest l*ark in IJrooklyn. 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. The two most 

 abundant and generally found are the sac spores in the winter 

 stage and those other spores in thread masses called couidial 

 spores, and which are present in the summer stage. Resides 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 for cells) of the 

 spermagonium are called spermatia. Resides being very small 

 the}' possess great motility. There is a fourth kind also de- 

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



