Oct. 7-Dec. 30, 1918 



Illustrations XV 



Page 

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



produced in 2 1 days in sand and loam maintained at different mois- 

 tMXG. contents and containing sodium chlorid, sodium carbonate, and 



sodium sulphate added in various concentrations 306 



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

 produced in 21 days in loam maijpitained at different moisture con- 

 tents and containing sodium chlorid, sodium carbonate, and sodiiun 



sulphate in various concentrations 307 



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

 produced in 2 1 days in loam and clay maintained at different mois- 

 ture contents and containing sodium chlorid, sodium carbonate, 

 sodium sulphate added in various concentrations 308 



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



produced in 2 1 days in clay maintained at different moisture contents 

 and containing sodium chlorid, sodium carbonate, and sodium sul- 

 phate added in various concentrations 310 



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



produced in 21 days in sand and clay maintained at different mois- 

 ture contents and containing sodium chlorid, sodium carbonate, and 

 sodium sulphate in various concentrations 311 



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



produced in 21 days in sand and clay maintained at different mois- 

 ture contents and containing sodium chlorid, sodium carbonate, and 

 sodium sulphate in various concentrations 3 12 



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



produced in 21 days in sand and peat maintained at different con- 

 centrations and containing sodium chlorid, sodium carbonate, and 

 sodium sulphate added in various concentrations 313 



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



produced in 21 days in loam and peat maintained at different mois- 

 tm-e contents and containing sodium chlorid, sodium carbonate, and 

 sodium sulphate added in various concentrations 316 



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



produced in 21 days in loam and manure maintained at different 

 moistiu-e contents and containing sodium chlorid, sodium carbonate, 

 and sodium sulphate in various concentrations 317 



27. Graphs showing the percentage of normal yield of dry matter of wheat 



produced in 21 days with various concentrations of added sodium 

 chlorid, sodium carbonate, and sodium sulphate 318 



A Contribution to the Biology of Friit-Fly Parasites in Hawaii 



Fig. I. Diachasma tryoni: Egg just laid; length 0.48 mm 420 



2. Diachasma tryoni: Egg mattu^e; length 0.65 mm 420 



3. Diachasma tryoni: Cast skin of first-instar larva, showing head charac- 



ters of first instar and serosal cellular mass still clinging to ventral 

 surface. . . . ; 422 



4. Diachasma tryoni: Lava of first instar, lateral aspect, showing right 



main tracheal trunk with branches, and characteristic position and 

 volume of egg serosal cells clinging to ventral surface 423 



5. Diachasma tryoni: Larva of first instar about to molt, lateral aspect 



showing food canal filled with fat globules and illustrating the begin- 

 ning of the formation of the meconium 424 



