LIST OF ILLUSTRATIONS XXI 
FIGURE PAGE 
405. Main Arteries of Man. 455 
406. Superficial Lymphatics of Arm and Hand . ... 456 
407. Longitudinal Section of Kidney. 457 
408. Diagram of Kidney Tubule ....... 458 
409. Diagram of Skin . 459 
410. A Model Reservoir. 463 
411. A Poor Reservoir . . . 464 
412. Nervous System of Man ........ 467 
413. Nerve Cells .......... 468 
414. Nerve Cells . 469 
415. Diagram to Show Reflex Action . . . . . . 470 
416. Section of Eye .473 
417. How We See the Pencil .474 
418. Plan of Ear . 475 
419. Alcoholic Test . 476 
420. Brain Control . 477 
421. Chart of Heart Pulsation.483 
422. Chart of Heart Pulsation . 483 
423. Chart of Heart Pulsation . 484 
424. Tuberculosis Cure, Summer. 490 
425. Tuberculosis Cure, Winter .491 
426. Milk Diluted to 498 
427. Diagram of Epidemic of Sore Throat ..... 499 
428. Malarial Swamp . 500 
429. X-ray of Foot of Girl Wearing High Heel Shoe .... 502 
430. X-ray of Foot of Girl Wearing a Sensible Shoe .... 503 
431. Male and Female Cooties . 515 
432. Adult Fruit-fly .523 
433. Fruit Parasitized by Fruit-fly .524 
434. Variation in Timothy Heads.527 
435. Variations in Yield of Timothy. 528 
436. Variation in Size of Wheat Heads ...... 529 
437. Heredity in Wheat . 530 
438. Leaf Galls on Grape . 531 
439. Heredity Shown by Comparison ...... 533 
