ILLUSTRATIONS 



PLATES 



GossYPOL THE Toxic Substance in Cottonseed 



Plate I. Effect of feeding cottonseed feeds to pigs: A. — Pig 3, showing con- page 

 dition on the ninety-fourth day on a feed containing ether-extracted cot- 

 tonseed kernels. B . — Pig 3 , showing condition on the fiftieth day. C. — Pig 

 4, showing condition on the twenty-seventh day on a feed containing vita- 

 mines. D. — Pig I, showing condition on the fiftieth day on a feed contain- 

 ing cottonseed meal. See figure G. E. — Pig 2, showing condition on the 

 twenty-seventh day on a feed containing gossypol. F. — Pig 3, showing 

 condition on the twenty -seventh day on a feed containing ether-extracted 

 cottonseed kernels. G.^Pig i, showing condition on the fiftieth day on a 

 feed containing cottonseed meal 102 



Irrigation Experiments on Apple-Spot Diseases 



Plate 2. A. — Early stage of bitter-pit on Northern Spy apple. B. — Cross 



section of the apple shown in A 138 



Plate 3. A. — Late stage of bitter-pit on Rhode Island Greening apple. B.— 

 Internal bro^\^ling accompanying bitter-pit. C— Jonathan-spot on Jona- 

 than apple. D.— Early stage of drouthspots on a Winesap apple from 

 Wenatchee, Wash. E. — Late stage of drouthspots on a Winesap apple. 

 F. — Cross section of the apple sho\vn in E 138 



Plate 4. A. — An apple orchard showing the furrow system of irrigation em- 

 ployed in the experimental work at Wenatchee, Wash. B. — ^Jonathan 

 apple tree showing the effects of drouth, Wenatchee, Wash 138 



Plate 5. A. — Cork on Yellow Newtown apple from Hood River, Greg. B. — 

 Cross section of the apple shown in A. C. — White Pearm.ain apple showing 

 the severity of the 1915 drouth at Wenatchee, Wash. D. — Cork, or "dr\-- 

 rot, " on a King apple. E. — Blister on an Esopus apple from Entiat, Wash. 

 F. — An extreme ca;se of Yorkspot on a York Imperial apple. G. — Cross 

 section of the apple shown in F 138 



A Study of the Plow Bottom and its Action Upon the Furrow Slice 



Plate 6. A. — A plow bottom with two sets of straight lines. B. — A plow bot- 

 tom, the surface of which is composed of each of two surfaces. C. — A plow 

 bottom similar to B, but vnth the surfaces merging into each other farther 

 back on the moldboard. D. — A plow bottom, the surface of which does not 

 contain an infinite set of straight lines 182 



Plate 7. A. — A plow bottom with a convex surface which has two sets of 

 straight lines. B. — Instrument for measuring the space coordinates of any 

 point of the plow bottom. C. — A sod plow showing the furrow slice turned 

 by it 182 



Plate 8. A.— Rows of wooden pins driven into the sod for estimating the 

 stretch of the furrow slice. B. — Furrow slice showing the position of the 

 pins when on the moldboard 182 



Plate 9. A. — Plow showing attachment used to obtain the x, y, and 2 coordi- 

 nates of points in the furrow slice. B. — Moldboard showing the paths of 

 five soil particles. C. — Measurement of the angle Ny by use of a protractor 

 and a plumb bob 182 



(V) 



