xviii Minnesota Plant Diseases. 



FIG. 98. Bacterial nodules on root of common bean. Original 195 



FIG. 99. The bacteria of such root nodules of the pea family as are 



shown in Fig. 98. Highly magnified. After Atkinson... 196 

 FIG. loo. Slime molds. Variously magnified. After De Bary and 



Cienkowski 197 



FIG. 101. Twig of a witches'-broom of spruce, showing the parasitic 

 plants of the mistletoe, which cause the brooming of the 



branches. Photograph by the author 199 



FIG. 102. A bucket pump. (The Deming Co.) 211 



FIG. 103. A knapsack pump. (The Goulds Mnfg. Co.) 212 



FIG. 104. A barrel pump. (The Deming Co.) 213 



FIG. 105. A simple type of barrel pump used in the horticultural de- 

 partment of the University of Minnesota Experiment Sta- 

 tion. Photograph by R. S. Macintosh 214 



FIG. 106. A gear-power force pump. (Victor Spraying Machine) 216 



FIG. 107. A barrel pump in action, on the farm of B. Hoyt, St 



Anthony Park, Minn 217 



FIG. 108. A powerful type of spray pump for orchard spraying. 



(Goulds Mnfg. Co.) 220 



FIG. 109. A complex type of spray pump used at the New York Ex- 

 periment Station for spraying several rows of asparagus at 



once. After S. A. Sirrine 222 



FIG. no. The apparatus shown in Fig. 109 in action. After F. A. -Sir- 



rine 224 



FIG. in. Various fixings, tools and appliances for spraying apparatus. 



After J. C. Blair 228 



FIG. 112. A convenient nozzle for spraying the under side of leaves. 



(Deming Co.) 230 



FIG. 113. Nozzle for spraying plants in rows. (Goulds Mnfg. Co.). ... 230 

 FIG. 114. An effective nozzle for mist-like sprays. (Goulds Mnfg. Co.) 231 

 FIG. 115. Powder gun, with attachments. (Leggett) 231 



