l886.] NEW-YORK MICROSCOPICAL SOCIETY. 79 



but they divide, and, after three or four years, are filled with 

 tissue, and there is probably little or no circulation in them ; that 

 he had without difficulty traced them through a twelve-foot 

 board. This was the longest he had observed. 



He had observed tyloses in a great many other species, and, 

 besides, in all the oaks and locusts. It was some time before he 

 had noticed this tissue in cutting sections. The knife not be- 

 ing sharp enough, tore the tissue out. It remains in the old 

 wood of the oak, and is about the last thing to decay. The So- 

 ciety would remember that in a photomicrograph exhibited by 

 him some time ago, it was shown that the mycelium of a fungus 

 had destroyed the greater portion of the fibres, but this tissue re- 

 mained intact. 



The President said that he had found that these cells, in var- 

 ious species of the oak, would resist severe treatment. They 

 are not always found in the duct when the section is cut. He 

 had used a sharp knife, but the tissue would frequently come 

 away in cutting the section, even when the greatest care was 

 used. 



FUR FIBRE. 



Mr. Brevoort gave to the Society the result of some observa- 

 tions made by him in studying the subject of fur fibres, which 

 will be found in the first article in this Number of the Journal. 



STREPTOCOCCUS VACCINA. 



Dr. W. H. Bates exhibited two slides showing Streptococcus 

 VaccincE, Animal, and Human, and said : " The first occurs in 

 minute, oval cells, either single, double, or in chains. The 

 specimens exhibited show all these conditions. The humanized 

 is the same after it has passed through the body. These organ- 

 isms are found at the point of vaccination, both in man and in 

 the lower animals, after inoculation." 



SPIRAL FIBRE OF BANANA STALK. 



The President exhibited a slide showing spiral fibre of the 

 Banana stalk, and read a paper describing the structure of the 

 fibres, which is published in this Number of the Journal. 



PLAGIOGRAMMA VALIDUM. 



Mr. Schultze exhibited a photomicrograph of a newly 



