Oct. 7-Dec. 30, 1918 Illustrations xni 



The Meadow Plant Bug, Miris dolabratus 



Page 

 Fig. I. Miris dolabratus: A, adult on timothy head in resting or feeding posi- 

 tion; B, female ovipositing; C, eggs from oviduct, nearly or quite 

 mature; D, mature egg ready for deposition; E, mature egg greatly 

 enlarged showing membranous operculum 182 



2. Miris dolabratus: Nymphs showing relative size of body and develop- 



ment of wing pads. A, first instar; B, second instar; C, third instar; 



D, fourth instar; E, fifth instar 185 



3. Miris dolabratus, genital segments: A, female; B, male of fifth instar 



nymph; C, female; D, male of adult 186 



4. Miris dolabratus: A-F, antennae of nymphs; F, antenna of adult male 



drawn to same scale and showing relative lengths of segments 194 



5. Reduviolus ferus L. : A, first instar; B, second instar; C, third instar; 



D, genital segments of female; E, fifth instar; F, adult male; G, 

 genitalia of male ig6 



Angxjlar-Leafspot op Cucumber: Dissemination, Overwintering, and 



Control 



Fig. I. Cross section of epidermal portion of cucumber fruit fixed eight days 

 after inoculation with Bacterium lachrymans, showing presence of 

 bacteria in stoma and tissues below 208 



2. Diagrams of cucumber fields to show relation of wind and drainage 



water to angular-leafspot dissemination 210 



3 . Diagram of cucumber field to illustrate picker dissemination of angular- 



leafspot a 12 



Plasticity op Biologic Forms op Puccinla. graminis 



Diagram i. Results of inoculations with Puccinia graminis from Agropyron 

 repens showing apparent bridging before biologic forms were 

 isolated 229 



2. Results of inoculations with Puccinia graminis tritici and P. 



graminis secalis from Hordeum jubatum, Moorhead, Minn 230 



3. Results of inoculations with Puccinia graminis from Agropyron 



smithii, Mandan, N. Dak 231 



4. Effect of intermediary hosts on Puccinia graminis secalis and 



P. graminis tritici from Agropyron cristatum, 232 



5. Results of inoculations made with Puccinia graminis secalis from 



Hystrix patula 233 



6. Results of inoculations with Puccinia graminis secalis from Agro- 



pyron repens after various intermediary hosts 2 34 



7. Results of attempts to increase the infection capabilities of 



Puccinia graminis from Hordeum jubatum, Minot, N. Dak 236 



8. Results of successive transfers of Puccinia graminis tritici from 



Agropyron tenerum to barley and other hosts 238 



9. Results of inoculations with Puccinia graminis tritici from Hordeum 



pibatum after various intermediary hosts 240 



10. Results of inoculations with Puccinia graminis avenae from Dactylis 



glomerdta 241 



Soil Factors Affecting the Toxicity of Alkali 



Fig. I. Diagram showing the number of wheat plants up and the dry matter 

 produced in 21 days in quartz sand of different sizes containing 



sodium chlorid 288 



2. Diagram showing the number of wheat plants up and the dry matter 

 produced in 21 days in soils of different texture containing sodium 

 chlorid added in various concentrations 289 



