408 



MANIPULATION. 



Pollen. — All the darker kinds may be 

 balsam, the more transparent either in 

 remarkable examples wiU be found in the 



Fuchsia globosa, 



Geranium Robertianum, 



Guernsey-lily, 



Iris fastidissima, 



Jasmine, 



Lychnis, scarlet, 



Acacia armata, 

 AnagaUis arvensis, 

 Calla JEthiopica, 

 Campanula, 

 Convolvulus major, 

 minor, 



mounted in Canada 

 fluid or dry; some 

 subjoined list : — 



Marvel of Peru, 



Polygonum orientale, 



Pentstemon, 



Sedum acre, 



Tiger-lily, 



Tulip, 



Seeds. — These are generally examined as opaque objects, 

 with a low magnifying power ; some from the orchis tribe, and 

 those that are termed by botanists " winged^'' may be mounted 

 in Canada balsam, and viewed as transparent objects. The 

 following list will contain the names of the most striking 

 specimens : — 



Dandelion, Orchis maculata, 



Eremocarpus, bifolia. 



Groundsel, Poppy, 



Lophospermum erubescens, Sorrel, 

 Manethia coccinea, Sycamore, 



Mignionette, Verbena. 



AnagaUis, 



Anethum graveolens, 



Bignonia radicans, 



Carraway, 



Carrot, 



Collomia grandiflora, 



Miscellaneous Structures ofajibrous character. — For the sake 

 of comparison of known with unknown vegetable and animal 

 fabrics, certain specimens of woody fibre, in the shape of flax, 

 hemp, or cotton, and of animal structures, such as silk, hair, 

 and wool, should be provided ; some of them may be examined 

 as opaque objects upon a dark ground, whilst others will require 

 to be viewed by transmitted light. Mummy cloths of different 

 kinds have often been matters of dispute with various micro- 

 scopists, as to the true nature of the material of which they 

 were composed. The late Mr. James Thomson, of Clitheroe, 

 first directed attention to the value of the microscope in these 

 researches, and demonstrated clearly that the material 

 employed by the Egyptians was linen, and by the Peruvians 

 cotton ; the former being known by its solid and cyhndrical 

 character, the latter by being a more or less flattened band. 

 The structure of silk and hair is widely difierent from that 

 of cotton or linen ; hence, in woven fabrics, a knowledge of 



