260 Inheritance of Glume Length and of Colour in Oats 



For purposes of measurement the glume of the fourth grain-con- 

 taining spikelet from the base of the ear was always used. Empty 



CHART I. 



o 



PLI 



I 



17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 



Glume Lengths in mms. 



basal spikelets were never counted. As the number of measurements 

 available in this experiment was not over large, and the separate 

 plotting of the lengths involving fractions of the unit would have jolted 

 the curve considerably, it was decided to record them as nearest whole 

 numbers. The method of dealing with these non-integral numbers is 

 shown in Table I which contains the data for Chart I. 



Totals for ) j^ ^1 , K « 

 each length) 222 



4 9 74 41 9i 2i 8i 5 2 3 3 1 2 1 1 



The only fraction considered was the half unit, or '5 mm. An 

 example taken from it will explain how the table has been compiled. 

 In addition to the six ears with a glume length of 27 mms. and the 

 five of 28 mms. there were three of 27*5 mms. Of these three, half 

 {i.e. \\ ears) go to the whole number which 27*5 mms. is immediately 

 below {i.e. to the 28 mm. length), and half to that which it is "5 mm. 

 above {i.e. to the 27 mm. length). This method of tabulation has been 

 employed in every case where a series of glume measurements has 

 been taken. 



