for the Microscope. 9 



54. COMPOUND SPIRAL OF LILY (Lilium candidunf). 

 The spiral consists of several threads, which remain 

 slightly attached to each other, and unroll in a band or 

 ribbon. (PL I., fig. 18.) 



55. COMPOUND SPIRAL OF WATER-LILY. The flower- 

 stalks and leaf-stalks of all the species of Water-Lily furnish 

 a compound spiral. This is a favourite stock object, espe- 

 cially when derived from Nymphcca edu/is, an Indian spe- 

 cies of Water-Lily. 



56. SPIRAL OF MEZEREON (Daphne mczereuiri). The 

 spiral in this instance often divides or branches, and, as 

 will be seen in the next, is accompanied by discs. (PI. I., 

 ng- 38.) 



57. Discs OF MEZEREON (Daphne mezcreum}. The 

 discs appear to belong to a secondary deposit, and occur 

 in the same vessels as the last, over which the tnird or 

 spiral layer is deposited. (PI. I., fig. 45.) 



58. PUNCTATE VESSEL OF POPPY (Papavcr somni- 

 ferum). The vessels from the stem of the Opium Poppy, 

 and probably other species, are punctured in bands around 

 the vessel. (PI. I., fig. 44.) 



59. PUNCTATE VESSEL OF BALSAM (Impaticns lal- 

 samina}. The vessels of the stem in the common Balsam 

 are punctate in a different manner. In both instances the 

 punctures are caused by deficiencies in the secondary 

 deposit. (PI. I, fig. 46.) 



60. PINE-WOOD Discs. The cells of Pine-wood are 

 characterized by circular pits or depressions, which are 

 concave, with a small orifice in the centre. The arrange- 

 ment differs in different coniferous trees. A thin pine 

 shaving will exhibit them. (PI. I., fig. 40.) 



6 1. DOUBLE Discs (Arattcaria imbricata). In this 

 wood the discs are usually in double rows in the cells. 

 Occasionally they may be seen in treble rows. 



62. Discs OF MAMMOTH TREE ( Wdlingtonia giganted). 

 These discs are large and distinct, generally in single 

 rows, sometimes double, in the wood-cells. Smaller discs 

 are distinct upon the transverse bands of the medullary 

 rays. 



