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POPULAR SCIENCE REVIEW. 
EXPLANATION OF PLATE LXXXIX. 
Fig. 1. Leaf of Sensitive Plant, Mimosa pndica ; a, in normal position ; 6, 
after depression by the approach of the hand. 
„ 2. Leaves of Venus’s Fly-trap, Dioncea muscipula } one of them closed on 
an imprisoned fly. 
„ 3. Tendril of Virginian Creeper, Ampelopsis virginica ; a , before contact ; 
6, after contact with a wall. 
„ 4. Stamen of Berberry, Berber is vulgaris ; a, normal position ; b , after 
excitation of base of filament. 
„ 5. Zoospores of Algae ; a, b, Conferva ; c, Vaucheria. 
„ 6. Spermatozoa ; a, Chara ; 5, Sea-weed, Fucus serratus. 
innate, specific principle, intelligent, free, and teleological. This principle is 
the hidden cause of the variability of organised beings, as well as the wonder- 
ful harmonies which have been established between one being and another.” 
