31 



The paper concludes with a discussion of : — 

 1. — The influence of environmental conditions other than 

 manuring- upon root gfrowth. 



2. — Influence of different types of manuring upon root growth. 



]\ . W'iNiFRED K. Brenchlkv. " The Development of the 

 Flower and Grain of Barley." Journal of the Institute 

 of Brewing, 1920. Vol. XXVI. pp. 615-632. 



An account is given of the development of the ear and flower of 

 barley from the time the young ear is about ^i-inch long until the 

 grain is fully developed. The method of flowering in barley is to 

 a large extent characteristic of the type, as in some cases the 

 glumes open and in others remain closed at the time of pollination. 

 With closed-glume flowering cross-fertilisation is of course im- 

 ix)ssible, and even with open flo\\ering it is the exception rather 

 than the rule. 



'I'he developmental history of the grain indicates that the awns 

 are of considerable j^hysiological importance, and in every barley 

 car the largest and heaviest grains are in the middle of the ear, and 

 the longest awns occur on these grains, indicating- some correlation 

 between weight of grain and length of awn. The awns are 

 essentially transpiring organs. Transpiration is most active 

 during the development of the spike and grains, rising to a maxi- 

 mum just about the time the grains reach the milk stage. 



\'. Marv D. Glyxne, B.Sc. and \'iolet G. Jackson, B.Sc. 

 " The Distribution of Dry Matter and Nitrogen in the 

 Potato Tuber (variety, King Edward)." journal of 

 Agricultural Science, 1919. Vol. IX. pp. 237-258. 



King I^dward Potatoes were grown in 1917 on Little Knot 

 Wood Field, Rothamsted, lifted about the end of vScptember, 1917, 

 and examined in the laboratory early in 1918. 



The percentage of dry matter in the potato tuber was 

 lowest in the skin ; it increased to the inner cortical layer, the 

 zone containing the greater part of the vascular system, and de- 

 creased towards the centre of the tuber. Typical results are : — 



DRY MATTER IN DIFFERENT ZONES OF THE TUBER. 



