ILLUSTRATIONS. 



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I. Fig. 1. Photomicrograph of tlie anterior end of a planarian with super- 

 niinierary ocellu.'i. 

 Figr. 2. Drawing explanatory of Fig. 1. [X 00.] 

 II. Change in temperature of uniaxiality in gyp.sum for variou.s wave-lengths. 



III. Change in the apparent optical angle in oil of glauberite for variou-s wave- 

 lengths and temperatures. 



IV. Change in temperature of uniaxiality in glauberite for various w-ave-lengths. 

 V. The exposure of thermometers in the study of plant and soil temperatures 



at the Weather Bureau Station, East Lansing, Mich. 

 V'l. Fig. 1. Fossil Beach, north of Pt. Betsie lighthouse. 



Fig. 2. Shore bluffs with "crater" dunes perched on glacial plateau. 

 VII. Pt. Betsie Dune Complex, showing typical blow-out on right; relic forest 

 patches in background, and lighthouse and coast guard .station. 

 Beech-Maple Hemlock Forest on fixed dunes. 

 Interior view of Border-Zone formation. 



Exterior of relic forest patch on Pt. Betsie Dune Complex. 

 Interior of Climax Forest, showing hemlock seedlings on decaying log. 

 The clover leaf-spot disease in various stages. (Leaves naturally infected.) 

 The clover leaf-spot fungus and its effect on the leaf. (29 figs.) 

 The clover leaf-spot fungus and its effect on the leaf. (11 figs.) 

 I'lants sprayed with an old, attenuated culture. 10 days. 

 Plants sprayed with a newly isolated, virulent culture. 10 days. 

 .\ photograph of the Picea excelsa bed, taken after the completion of the 

 experiment and intended to convey an accurate idea of the method of 

 procedure. 

 Plate XVIII. Fig. 1. Bunches of Pinus Strobus grown under tlie different conditions. 

 Fig. 2. Typical individuals of above bunches. 

 XIX. Taproot development of Pinus Strobus. 

 XX. Fig. 1. Bunches of Picea excelsa grown under the different conditions. 



Fig. 2. Typical individuals of above bunches. 

 XXI. Taproot development of Picea excelsa. 

 XXII. Typical individuals of Pinus resinosa. 

 XXIII. Taproot development of Pinus resinosa. 



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FIGURES. 



Figure 1. Tadpoles of Rana cktniitans, showing distribution of sense organs. Length, 



4 cm. 

 Figure 2. Cross-section of epidermis from tadpole of Raiui cinmitnns, showing structure 



of a lateral line organ. 

 Figure 3. Diagram of geological conditions with reference to oil wells sunk in the region 



studied. 

 Figure 1. Diagram to illustrate conception that religion, education, government, etc., are 



discrete social structures. 

 Figure 5. Diagram to illustrate proper conception of the relations of religion, education, 



government, etc., in the field of social life.. 

 Figure G. Diagram to illustrate suggested church organization. 

 Figure 7. Curves: to show daily readings of the "solar radiation" thermometer (dotted 



line) ; plant thermometei- readings at mid-day (in solid black) ; the 24-hour 



elongation of four plants, in millimeters (dot and dash). Readings were 



made at 2 p. m. daily. 

 Figure 8. Curves: to show the total growth (elongation) of four plants for the 24-hour 



periods ending at 2 p. m. daily (dot and dash) ; the maximum temperature 



of the air (in solid black) ; the mean temperature of the air (dotted line, B) ; 



and the soil temperature (dotted line. A). 

 Figure 9. Geography of N. W. corner of Benzie County, Michigan. 

 Figure 10. Geology of Crystal Lake Bar Region. 

 Figure 11. Ecology of Crystal Lake Bar Region. 



Figure 12. Chart illustrating the hypothetical phylogeny of the grasses. 

 Figure 13. Map of Detroit Zoological Tract. 

 Figure 14. Simple potometer.. 

 Figure 15. Plant with van Tieghem rings. 

 Figure 16. Pinus laricio (after Coulter and Chamberlain). 

 Figure 17. Pinus sylvestris (after Coulter and Chamberlain). 



