Fig. 127. 



PLATE XX. 



Fig. 128. 



Tin can, for containing Canada 

 balsam, p. oO. 



Instrument for applying gradxtated pressure to objects 

 under thin glasa p. 51. 



Fig 



Air-pump, for removing air from microscopical specimens, p. 77. 



Fig. 130. 



Fig. 131. 



Fig. 132. 



Test bottle, "with stirring 



rod and cap to prevent 



entrance of dust. 



Glass ahade, with sulphuric acid 



and wiie gauze support for 



drying objects, p. 76. 



Pipette inserted through. 



cork or stopper of teat 



bo tUe. 



[To face page 78. 



