INTRODUCTION 7 



with this and one needle than with a pair of needles. 

 A scalpel is useful, but the small sharp blade of a 

 penknife will answer instead. It is well to have a 

 piece of black paper or cardboard on which to place 

 hairy spikelets. The hairs on the different parts 

 show up well against this background. 



It is the aim to use, so far as possible, the charac- 

 ters that may be seen in the different parts of the 

 spikelet with but little dissection. When further dis- 

 section is necessary, instructions will be given at the 

 end of the lesson requiring it. 



