246 Phillips on a Comparative Study of the 



the same cell, though either might be absent, and in portions 

 of the trichomes where the cells were actively dividing, he 

 observed at times a regular change from cells having gran- 

 ules to others destitute of them, and again back to the former 

 condition. No chromatophore was found, that which had 

 been described as such by other authors being a crystalloid. 

 Nuclei could not be demonstrated, hence he denied the 

 existence of indirect division. A central body, staining with 

 haematoxylin, was found. Vacuoles were not present in 

 the normal plants, and their contents when found in path- 

 ological material, were not known to him. Division of the 

 cell was direct and proceeded very rapidly, often the "col- 

 lar-like" ingrowth from the cell wall which caused division 

 by strangulation formed for the granddaughter cells before 

 the daughter cells were fully separated. He found the 

 end cells protected by a calyptra, formed by the last cell 

 ceasing to divide and forming around itself a hard coat. 

 In the mature state, this calyptra was quite diagnostic for 

 the species. Another striking feature of the end cells of 

 certain Oscillariese was the presence of what appeared to 

 be long sluggish flagella. These, however, he dismissed as 

 not characteristic, and as being really parasitic growths, like 

 bacteria, having no motion of their own. They did show 

 a certain movement, he admitted, but he referred it to the 

 oscillation of the trichome. 



In 1888, Scott (71) exhibited some slides and reported 

 the work of Miss H. V. Klaassen before the Linnean Soci- 

 ety. The work was performed upon Tolypothrix cooctitis 

 and three species of Oscillaria. He used two methods: (o) 

 by treatment for five minutes in methylated ether, and then 

 staining for four minutes in Kleinenberg's haematoxylin and 

 mounting in balsam, or {h) by staining for two hours in 

 picro-nigrosin and clearing for two minutes in chloral 

 hydrate and mounting in pure glycerin. By either of these 

 methods he recorded a rounded central body composed of 

 fibrils, very similar to the skein stage of the karyokinetically 



