134 



Central Bodtj. On treatiiu'iit with iiiclhykMU' MiU' a central Imdy appi'Uiv; 

 it takes a living stain, is more or K'ss ruunded and ccnlral in the cell. Accoi'ding 

 to the investigations of Palla it is honiogeneons, ImU according to Hieronymus it 

 is more or less dift'erenliated into grannies, having a tiiirillar arrangement. The 

 libriila', however, are not snrronnded by a mend)rane. and may I'Xtend in any di- 

 rection tiiroughont liie cell, even jienetrating the cliromatophore. The iirannles 

 are strikingly signilicant of tiie cyanophyeio grains of Hieronymns. Thongli 

 the central body in its reaction towards stains, etc., yiidds rcsnlts similar to liio>e 

 of nuclei, yet it doi's not appear to be a nmdens, or at any i-ate it does not show in 

 detail the characteristics of a nucleus, (ix found in tin- lii(/lier planl-<. 



Murux (jlol>ule'<. In the parietal jiart of tlu' cytoplasm of most species occur 

 globidar structures which are most numerous along the septa. In appearances 

 they harmonize with the description of Schmitz's mucus-globules. But according 

 to the investigations of Hieronymus they are identical with cyanophycin grains. 

 There is no similarity in results, for mucus globules are insoluble in hydrochloric 

 acid and stain with methylene Idne. while cyanophycin grains are soluble in 

 hydrochloric acid and do not stain with methylene blue. 



Vncuoles. Irregulaidy distril)Uted through the contents of the cell are usually 

 a number of trans]iarent s[)aces of cell sap or vacuoles. They vary in size and in 

 number. 



tJd. Dro})S of oil were observed in the germinating spores of Gldotrichia. 



'The Cell W(dl. The sti'ucture of the cell wall presents, to a slight degree, a 

 form' of lamination. It is of i-omparative thickness, and luore or less colorless. 

 As to its chemical comijosition, the results obtained by the ai)plication of acids 

 and stains were to'i fragmentary to draw any satisfactory conclusions. However, 

 I found it higiily resistant on treatment with acids, esjjecially 3o per cent, chromic 

 and concentrated suli)huric. With the anilines very decided stains were obtained. 

 In short, of the live recognized kinds of cell walls, one type ])Ossesses [jropei'ties 

 intermediate between those oi fungus-cellulose and cutin. 



The Sheath. Peripheral to, and conjunctive with the cell wall is the delicatt", 

 mendiranous sheath. In some sjiecies the sheath is wanting, imt in most cases it 

 is present and marked by varying degrees of thickness, even at times giving a 

 stratified appearance. Chemically, it differs considerably from the cell wall, but 

 it is closely allied to cellulose. In many cases it turns blue on treatment with 

 cliloriodide zinc; is mostly soluble in sntlieiently concentrated chromic and 

 sulphuric acid, but is insolubU' in cujtra-ammonia. Agreeing with cellulose, it, 

 loo, possesses the pro[)erty of cuticularization. 



