Instructions to Students 



A metrical scale and table of measures is here given, that the student 

 may have a present guide to such measurements as are given in myco- 

 logical publications. 



INCHES 



i Metre (m) 39-371 Inches. 



I Decimetre (dm) 3-9371 Inches. 



i Centimetre (cm) 39371 Inch. 



i Millimetre (mm) 039371 Inch. 



i Line. 



T T 2 Inch. 



i Micron 



Millimetre 

 Inch. 



i Gramme 15-433 Grains Troy. 



I Decigramme 1 . 5433 Grains Troy. 



I Centigramme 15433 Grains Troy. 



i Milligramme 015433 Grains Troy. 



The spore color being determined, turn to the Genera Chart, showing 

 Use of Charts spores of like color. Ascertain from the specimen whether 

 of Genera. or no t j S ca p or hymenophore is distinct or easily sep- 



arable from the stem and the gills free from the stem; if they are, it 

 may belong to one of the genera in the upper row of figures ; if the cap 

 is not easily separable nor the gills free, look at the shape of the gills, 

 and find on the chart a corresponding gill-shape. It is probable that 

 the genus can thus be determined. Then turn to this genus in the text, 

 read the heading, look over the "Analysis of Tribes," go to the tribe 

 nearest in designating the properties of the specimen ; comparing the 

 specimen with the descriptions of species given thereunder, will probably 

 enable the seeker to decide upon its name. 



It should be remembered that the descriptions in the text are of the 



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