CLASSIFICATION OF VEGETABLE PEEPAEATIONS. 401 



kinds may be detached and then mounted either in fluid or in 

 Canada balsam. The following list will exhibit a few of the 

 most interesting varieties : — 



Acanthodium, Borago officinalis, Durio zebethinus, 



Althaea, Deutzia scabra, Elaeagnus angustifolia, 



Anchusa tinctoria, Dolichos prvu-iens, Nepenthes, 



angustifolia, Dorstenia, Verbascum. 



Cellular Tissue. — This tissue enters more largely than any 

 other into the composition of vegetable structures; perfect 

 cells may be obtained very readily from ripe pulpy fruits, 

 such as the strawberry, raspberry, and peach; from other 

 plants they may be procured by maceration, or the shape of 

 the individual cells may be shown by vertical and horizontal 

 sections. The following list will embrace some of the most 

 interesting varieties : — 



Pulp of Orange, Sections of Lilium candidum (leaf), 



Peach, Nuphar lutea, 



Raspberry, Pine, 



Strawberry, Rice-paper plant. 



Sections of Pith of Elder, Rush, 



FUix mas, Sparganium ramosum. 



Fibro-cellular Tissue. — This very elegant tissue, consisting 

 of a cell, in the interior of which a spiral fibre is coiled up, is 

 found readily in every species of moss of the genus Sphag- 

 num. In some of the orchidaceous plants, the leaves are 

 almost entirely made up of it, from these the cells may be 

 obtained either by maceration or by section ; the best examples 

 are afforded by the following plants : — 



Oncidium Bonplandianum, Pleurothallis angustifolia, 



Carthaginense, ruscifolia, 



divaricatum, Saccolabrium guttatum, 



pumiLum, Sphagnum. 



A modification of this form of tissue is found in the testa 

 of some seeds; a portion of it from the following, when 

 wetted, will exhibit both the cell and the fibre in a very beau- 

 tiful manner : — 



Salvia, CoUomia grandifolia, CoUomia linearis, Acanthodium. 

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