XXVI 
Journal of Agricultural Research 
Vol. V 
Identity or Eriosoma Pyri 
Page 
Fig. i. Structural characters of the species of Prociphilus. A , P. bumuhe: 
Distal segments of antenna of spring migrant. B } P. poschingeri: 
Distal segments of antenna of spring migrant. C, P. venafuscus: 
Distal segments of antenna of spring migrant. D, P. venafuscus: 
Distal segments of antenna of fall migrant. E, P . pyri: Distal seg¬ 
ments of antenna of fall migrant. F, P, xylostei: Distal segments of 
antenna of spring migrant. G, P. populiconduplifolius: Distal 
segments of antenna. H, P. corrugatans: Distal segments of antenna 
of spring migrant. I, P. corrugatans: Distal segments of antenna of 
spring migrant. /, P . alnifoliae: Distal segments of antenna. K, P. 
tessellatus: Distal segments of antenna. L, P. bumulae: Thoracic wax 
plates. M, P. poschingeri: Thoracic wax plates. N, P. xylostei: 
Thoracic wax plates. 0 , P. venafuscus: Thoracic wax plates. P, P. 
corrugatans: Thoracic wax plates. Q , P. pyri: Thoracic wax plates. 
R, P. alnifoliae: Thoracic wax plates. F, P. populiconduplifolius: 
Thoracic wax plates. T, P. tessellatus: Thoracic wax plates. 1117 
A New Irrigation Weir 
Fig. 1. Plan, elevation, and section of concrete weir box in the hydraulic 
laboratory of the Colorado Experiment Station; also arrangement of 
experimental weir section for Nos. 1 to 6 and 13 to 16, in Table I- 1128 
2. Plan of experimental weir box for Nos. 7, 12, 18, 20, and 30 to 34 in 
Table 1 . 1130 
3. Plan of experimental weir box for Nos. 8 and 11, Table 1 . 1130 
4. Plan of experimental weir box for Nos. 9 and 10, Table I.;. 1130 
5. Plan of experimental weir box for No. 17, Table 1 . 1131 
6. Plan of experimental weir box for No. 19, Table 1 . 1131 
7. Plan of experimental weir box for Nos. 21,22,24, and 2 5, Table 1 . 1131 
8. Plan of experimental weir box for No. 27, Table 1. 1132 
9. Plan of experimental weir boxfor No. 28, Table I. 1132 
10. Plan of experimental weir box for No. 29, Table 1. 1132 
11. Plan of experimental weir box for No. 35, Table 1 . 1133 
12. Plan of experimental weir box for No. 36, Table 1 . 1133 
13. Plan of experimental weir box for No. 37, Table 1 . 1133 
14. Experimental discharge data plotted logarithmically and curves drawn 
from values computed from standard equation for new irrigation 
weir. 1134 
15. Coefficient and exponent values of individual discharge equations 
plotted against weir length. 1135 
16. Plan, elevation, and section (standard) of new irrigation weir box_ 1136 
Inheritance or Fertility in Swine 
Fig. i. Curve of litter frequencies in the P generation of swine. 1156 
2. Curve of litter frequencies in the Pi generation of swine. 1157 
3. Curve of litter frequencies in the F 2 generation of swine. 1157 
4. Diagram of the combined litter frequencies for the three generations of 
swine analyzed into its component curves. 1158 
A New Spray Nozzle 
Fig. i. Diagram showing the characteristic differences between the three forms 
of impinging-stream nozzles.... 1178 
