190 UTRICULAR STRUCTURES. 



closed by a homogeneous membrane, and individualized 

 without the influence of a nuclear utricle ; it is merely the 

 mediate elementary organ of the vegetable organism. 

 The following kinds of utricle may be distinguished : 



1. Nuclear utricle, Nucleus. It originates under the 

 influence of a nucleolus, and contains, at least in the earlier 

 periods of its life, scarcely anything, excepting one or more 

 nucleoli (colourless or coloured), besides mucilage. It 

 occurs (with the exception of those which originate in a 

 parent-cell) only immediately in the cell (not in another 

 utricle). 



2. Spermatic utricle. It originates, probably, like the 

 nuclear utricle, in like manner, under the influence of a 

 nucleolus. It contains principally mucilage, and produces 

 a spermatic filament in its interior. The spermatic utricle 

 probably occurs originally merely in cells, and in any case 

 never inside other utricles. 



3. Nucleolus. It contains mucilage, and occurs (some- 

 times with the exception of those around which the 

 nuclear utricle has not yet been formed) only inside the 

 nuclear utricle. 



4. Mucilage-utricle. It contains mucilage, but no 

 nucleolus, and occurs immediately in the cell (not in other 

 utricles). 



5. Proliferous utricle. It at first contains mucilage, 

 but no nucleolus, subsequently colour- or starch-utricles., 

 which, after its solution, become free. It occurs only free 

 in the cell (not in other utricles). 



6. Colour -utricle. It contains colouring matter, but no 

 nucleolus, and may be named according to the colour. 

 It frequently contains also starch-utricles. It occurs free 

 in the cell as well as in old nuclear and proliferous utricles. 



7. Starch-utricle, starch-granule. It contains layers of 

 thickening of deposited starch, and occurs free in the cells, 

 as well as in old nuclear, colour, and proliferous utricles. 



