VTii Journal of Agricultural Research voi.x 



Page 

 Plate 32. A-B. — A cow (No. 648) and her calf, showing the effect in 191 5 of a 

 ration of wheat grain, wheat straw, and alfalfa hay. C-D. — The same cow 

 (No. 648), showing the effect in 1916 of the second gestation on the same 

 ration, -ft^heat grain, wheat straw, and alfalfa hay. E. — ^A cow (No. 662) and 

 her calf, showing the effect of a ration of com meal, starch, wheat embryo, 

 and com stover 198 



EV.'VPORATION FROM THU SURFACES OF WaTER AND RivER-BED MATERIALS 



Plate 33. General view of the irrigation field laboratory, Denver, Colo., look- 

 ing west 262 



Plate 34. A. — Hoff hook gage for evaporation. B. — Evaporation tank 3 after 



a sandstorm. C. — Snow-covered evaporation tanks 4 end 7 262 



Plate 35. A. — Three anemometers during a test run. B. — Evaporation 



tank 7 262 



Plate 36. A. — Apparatus used for comparison between still and flowing water, 

 together with tanks 8, 15, and 3. B. — A heated evaporation tank similar 

 to No. 23, 24, and 25 262 



Plate 37. A. — United States Weather Bureau standard pan for class A station. 



B. — United States Geological Survey standard floating tank 262 



Plate 38. A. — Water-jacketed evaporation tanks of the Fortier type. B. — 



Appai'atus for weighing tanks 262 



Studies on Oat Breeding — V: The Fi and Fj Generations op a 

 Cross between a Naked and a Hulled Oat 



Plate 39. A. — A head of the Victor oat, line 262. B. — A head of the naked 

 oat, Avena sativa nuda var. inennis. C. — A head of an F, generation 

 plant of the cross 9 Victor X c? Avena nuda 312 



Plate 40. A. — Single spikelet of Avena nuda. B. — Single spikelet of the 



Victor oat 312 



Plate 41. A. — Glumes of the Victor oat: From left to right — One of the outer, 

 sterile, covering glumes, or the gluma; lower flowering glume, the palea 

 inferior, and upper flowering glume, the palea superior. B. — Glumes of 

 the naked oat: From left to right— One of the glumae, palea inferior, and 

 palea superior 312 



Plate 42. A. — ? Victor X <? Avena nuda F2: A branch of a plant bearing 

 biflorous spikelets containing naked kernels. B. — ? Victor X cf Avena 

 nuda Fj: A white grain showing no pubescence at the base of the lower 

 grain. C. — Caryopsis of Avena nuda 312 



Plate 43. A. — 9 Victor X <^ Avena nuda: A head of an Fg plant bearing only 

 completely hulled grain. B. — 9 Victor X d Avena nuda: A head of an Fg 

 plant bearing only hull-less grain. C. — 9 Victor Xd Avena nuda Fg: a, 

 Spikelet with intermediately hulled grain; b, dorsal view of same 312 



Plate 44. 9 Victor X S Avena nuda Fj: Types of grain. From left to right — 

 Multiflorous spikelet bearing naked grain, intermediately hulled grain and 

 completely hulled grain 312 



Plate 45. 9 Victor X ^ Avena nuda F2: Types of grain segregating in the sec- 

 ond generation. From left to right — Multiflorous spikelet bearing naked 

 grain, spikelet bearing naked grain and showing reduction in number of 

 florets, intermediately hulled grain and completely hulled grain 312 



Plate 46. A. — Lower grain of the Victor oat showing the long but sparse 

 pubescence at the sides of the base. B. — 9 Victor X (? Avena nuda F./. 

 Lower grain showing a rather thick pubescence at the sides of the base. 

 C. — 9 Victor Xd Avena nuda F,: Dorsal view of upper grain showing 

 pubescence at the sides of the base 312 



Plate 47- ? Victor X d Avena nuda ¥2: A spikelet showing pubescence on 



both lower and upper grain 312 



