_e._ Poison-glands 357 _f._ Adhesive or cement-glands 360 _g._ The wax-glands 361 _h._ “Honey-dew” or wax-glands of Aphids 364 _i._ Dermal glands in general 365 DEFENSIVE OR REPUGNATORIAL SCENT-GLANDS 368 Eversible coxal glands 369 Fœtid glands of Orthoptera 369 Anal glands of beetles 372 The blood as a repellent fluid 374 Eversible glands of caddis-worms and caterpillars 375 The osmeterium in Papilio larvæ 377 Dorsal and lateral eversible metameric sacs in other larvæ 377 Distribution of repugnatorial or alluring scent-glands in insects 382 THE ALLURING OR SCENT-GLANDS 391 THE ORGANS OF CIRCULATION 397 _a._ The heart 397 The propulsatory apparatus 401 The supraspinal vessel 403 The aorta 404 The pericardial cells 405 Pulsatile organs of the legs 405 _b._ The blood 407 The leucocytes 407 _c._ The circulation of the blood 409 Effects of poisons on the pulsations 412 THE BLOOD TISSUE 419 _a._ The fat-body 419 _b._ The pericardial fat-body or pericardial cells 420 Leucocytes or phagocytes in connection with the pericardial cells 421 _c._ The œnocytes 423 _d._ The phosphorescent organs 424 Physiology of the phosphorescence 426 THE RESPIRATORY SYSTEM 430 _a._ The tracheæ 431 Distribution of the tracheæ 432 _b._ The spiracles or stigmata 437 The position and number of pairs of stigmata 439 The closing apparatus of the stigma 441