Scientific Riddles |
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acid activity adrenalin animals answer bacteria beauty become beetles behaviour birds blood body brain called carbon cat's cells changes CHAPTER chemical chimæra chlorophyll clairvoyance cold colour common course crustaceans crystal-gazing cuckoo Darwin dream earth earthworms egg-cell experience expression fact female ferment fertilized flowers formic acid galls Gilbert White glands green hair hormones hypnosis illustrated impulse insects instance instinctive intelligent interesting kind larvæ laughter light living creatures living matter male mammals man's means mental microbes mind Mountain Hares muscles narwhal naturalist Nature nerve nerve-cells nest ordinary organic evolution ovum parasites parthenogenesis perhaps physiological pigment plants possible probably proteins protoplasm purpose puzzle question regard Rotifers scientific scrying seems sense sensitiveness sensory sleep sometimes species spermatozoa stimuli stoat structure substances suggestion surface tail telepathy temperature things tion tissues unsolved problem usually whole worm