44 
Olive. liitotic division of tlie nuclei of tlie Cvauoohyceae. 
Fig. 79. Another lilainent. similarly stained, in wbich. no spore is as vet 
differentiated. Tlie central body in tlie yonng lieterocyst is liere. 
nnlike in tlie older conditions, somewkat stained by tlie metliylene blne. 
Fig. 80. A longitudinal section, stained witli Heid.", showing botli tlie 
cliromatic and acliromatic elements of tlie central bodies. Some in 
tbe vegetative cells are spindle-sliaped: some are apparently under- 
going division. 
Fig. 81. A vegetative cell, freshly stained witli metliylene blne, showing a 
large vacuole in tlie cytoplasm. 
Fig. 82. A cross section of a vegetative cell, stained witb Heid, and eosin. 
One can see abont 8—10 cliromatin granules lying in a blnisb achro- 
matic snbstance. 
Fig. 83. A cross section, sliowing only abont 6 cliromatin grannles. 
Fig. 84. -Cliromatin and acliromatin in longitudinal section. Heid. 
Fig. 85. Anotlier similar preparation. Heid. 
Fig. 86. A longitudinal section stained witb Flem.: tbe central body is 
not properly differentiated. 
Fig. 87. Cross sections, similarly stained. 
Fig. 88. A preparation. sliowing lieterocyst, spore. and one vegetative cell. 
Heid. 
Fig. 89. A longitudinal view, sliowing a slime globale (sometimes stained 
dark), imbedded in eacli nucleus. One cell is being divided by a 
ring-formed wall. Heid. 
Fig. 90. Vegetative cells, stained witli Heid. In two cells, tlie central 
body is overstained: in tlie tliird, tbe cliromatin granules are apparent. 
Fig. 91. A yonng lieterocyst, sliowing a resting nucleus. Heid. 
Fig. 92. A longitudinal section.- in wbicli tlie central body is Trat poorly 
differentiated. Heid, and eosin. 
Fig. 93. A yonng spore, sliowing a resting nucleus. Tbe cyanophycin 
grannles in tlie cytoplasm are stained red. Heid, and eosin. 
Fig. 94. A mature spore. freshly stained witli metliylene blue. Tlie dense 
peripkeral porfion of tlie protoplasm appears to be witbout granu- 
lation, wliereas tlie central body itself contains numberiess cyano- 
pliycin grannles. 
Fig. 95. A longitudinal section of a mature spore, stained witli Flem.. in 
which tlie central body is seen to be completely filled witli unstained 
(or sometimes red witli safranin) cyanopliycin grannles. In tlie inter- . 
stices between tlie cyanopliycin, are tlie darkly stained cliromatin 
granules. 
Fig. 96. A cross section of a mature spore, stained witli Flem. Tbe un¬ 
stained cyanopliycin granules are liere seen to occupy only tlie outer 
portion of tbe central body. In tbe middle is an acliromatic sub- 
stance. Tlie dark granules are cliromatin. 
Fig. 97. A similar section, in wbich. some cyanopliycin granules appear to 
be in tlie cytoplasm as well as in tlie periplieral part of tlie central 
body. Flem. 
Fig. 98. A cross section stained witli anilin blue and eosin. Tke cliromatin 
is liere not differentiated. Tlie cytoplasm and acliromatin stain alike 
blue. 
Fig. 99. A cross section of a somewliat younger spore than tlia 
sliown in fig. 97: similarly stained. Tlie periplieral cliromatopliore 
still contains some cyanopliycin. 
Fig. 100. A cross section of a yonng spore, stained witb Heid, and eosin. 
Tlie nucleus possesses a delicate membrane and karyolympli. Tbe 
cyanopliycin is stained red. 
Fig. 101. Cross section of a very voung spore. sliowing a nucleus in resting- 
condition. Flem. 
Fig. 102. A similar section, similarly stained, of a somewliat older spore. 
Fig. 103. A still older spore in cross section. Tbe nuelear membrane lias 
not yet beeil broken down. 
