32 eS tructural ee Ph iysiological Botany. 
+. formation may be distinguished :— 
Chap. VI.) 
cence of two or more protoplasmic 
appearance of an opening at the 
point of contact, concluding with 
of the two cells for the purpose of 
reproduction (production of spores). 
: In its typical form it is limited to a 
- -__-FiG.54.— Conjugation and spore- few Algze and Fungi. (Fig. 54.) 
Spey formation of Szrogyra qut- 
cell not yet conjugated ; c,d 
ee : successive stages of conjuga- the formation of two or more [PAs 
acs 3 
es Oh hs 320) toplasmic bodies out of one. 
the protoplasm which is destined for the new cell losing its 
“previous power of motion, and contracting into a spherical 
form. When the original cell, termed the mother-cell, pos- — 
-.- -gesses a nucleus, this process is preceded by the formation 
of fresh nuclei which are destined for the future cells, the 
_-— daughter-ceils (Fig. 55, I.). The formation of these new 
* *.~ secondary nuclei takes place either by the division (most 
re. a _ frequently the bipartition) of the existing nucleus, or by their 
<'. primary nucleus of the mother-cell; as many new nuclei 
ve & uo ’ or-even of inorganic bibetanices Three main types ee f celle oe 
- 1. The renewal or rejuvenescence of a cell, ze. the ‘erage a 
Bee tion of a single new cell from the entire protoplasm ofacellal- 
ee ee in existence. This occurs in the formation of a swarm- — 
Por spore out of the entire contents ofa 
| : vegetative cell, especially among the — 
Alge (see Classification of Alge, 
2. Conjugation, or the coales- 
bodies in the formation of a cell. — 
This begins with the lateral approach © 
of two neighbouring cells, and the — 
the complete union of the contents _ 
nina: a@ amature spore; da 3. The multiplication of cells, OF 22: 
Each of these modes of cell-formation commences by 
~__-re-formation after the previous absorption of ‘the nee 
> being formed as there are cells to be produced. In the further — ue 
> 
x , 
ek 2 J F MS - id = 
ee ee ose ak hn Bel Sy Pita Ft 
eT ae Pe ON ge ee ee ee ne 
> 
>. 
Te 
Pe 
a 
ele eo 5 
