44 Olive. Mitutif tlivision of the niiflci df f lic < 'yaiiophyceae. 



ViiX. 79. Another lilanieut, similaily stiiiiicd. in w liicli no sperre is as yet 



diffi'i-fiitiatcil. The feiitnil bddy in tlie ymin«;- lieteroeyst is liere, 



unlike in tlie older eonditiuiis, soinewliat staiiied by tlie niethylene blue. 

 Fig. 80. A • lonjritudiual sectiou, staiued witli Heid.. showing" both tlie 



chrnmatic and acbroniatie elenient.s of the ceiitraJ bodies. Soiiie in 



the vegetative i-ells are sjjindle-.^liajjed; syme ai"e . apparently uiider- 



going division. 

 Fig. 81. A vegetative cell, freshly stained witli niellivlone l)lne, .showing a 



large vai-iiole in the cytoplasni. 

 Fig. 82. A cross section of a vegetative cell, stained with Heid. and eosin. 



One can see about 8 — 10 chromatin grannles i.ying in a l)lnish achro- 



niatic siibstance. 

 Fig. 83. A cross section, showing only about <> chroiuatin grannles. 

 Fig. 84. Chroniatin and achroniatin in longitudinal section. Heid. 

 Fig. 85. Another siniilar preparation. Heid. 

 Fig. 80. A longitudinal section stained with Fl cm.: the central body is 



not properlj' dii'i'erentiated. 

 Fig. 87. Cross sections, similarly- stained. 

 Fig; 88. A preparation. .shoAviiig hetei-ocvst. spore. and «»nc vegetative cell. 



Heid. 

 Fig. 89. A longitudinal view, showing a slime globule (sonietinies stained 



dark), inibedded in eacli nncleus. One cell is being divided by a 



ring-f'ormed wall. Heid. 

 Fig. 90. Vegetative cells, stained with Heid. In two cells, the central 



bodj^ is overstained; in the third, the chroniatin grannles are apparent. 

 Fig. 91. A young lieteroeyst, showing a resting nncleus. Heid. 

 Fig. 92. A longitudinal section. in wliich the central bod}' is bnt poorlj'" 



differentiated. Heid. and eosin. 

 Fig. 93. A young spore, .showing a resting nuclens. The cyanophycin 



gi-aiuiles in the cji;oplasm are stained red. Heid. and eosin. 

 Fig. 94. A niature spore. freshh" stained with methylene blue. The dense 



peripheral po'rtion of the jjrotoplasni aj)pears to be without granu- 



lation. whereas the central body itself contains numberless cyano- 



pliycin grannles. 

 Fig. 95. A longitudinal section of a niatnre spore. stained with Flem. . in 



wliich the central bodj- is seeu to be completely iilled with unstained 

 (er sonietinies red with safranin) öjj^anophycin grannles. In the inter- 



stices between the cyanophycin. are the darkly stained chroniatin 



grannles. 

 Fig. 96. A cross section of a mature spore, stained with Flem. The un- 

 stained cyanophycin grannles are liere seen to occupy only the onter 



portion of the central body. In the middle is an achroniatic snb- 



starice. The dark granules are chroniatin. 

 Fig. 97. A similar section, in wliich some cyanophycin granules appear to 



be in the cytoplasm as well as in the peripheral part of the central 



body. Flem. 

 Fig. 98. A cross section stained with aiiilin blue and eosin. The chromatin 



is here not differentiated. The cytoplasm and achromatin stain alike 



blue. 

 Fig. 99. A cross section of a somewhat j^ounger spore than tlia 



shown in fig. 97; similarly stained. The peripheral chromatophore 



still contains sonie cyanophycin. 

 Fig. 100. A cross section of a young spore, stained with Heid. and eosin. 



The nncleus possesses a delicate membrane and kaiyolymph. The 



c3'anophycin is stained red. 

 Fig. 101. Cross section of a very young spore, showing a nncleus in resting 



condition. Flem. 

 Fig. 102. A similar section, similarly stained, of a somewhat older spore. 

 Fig. 103. A still older spore in cross section. The nuclear membrane has 



not vet beeil broken down. 



