Syringe, why will the water leak out, but not run, 858 Syringe, why cannot the handle be pressed in, if a finger is kept on the orifice, 859 Tannin, what is it, 1257 Taste, why do we, 996 Taste, why are some substances sweet, others sour, &c., 997 Taste, why is it most powerful after substances have been a little while in the mouth, 998 Taste, why if we put out the tongue and touch it with a nub of sugar, shall we perceive no taste, 999 Taste, why when we draw in the tongue do we then perceive the taste of the sugar, 1000 Taste, through what nerves are we made sensible of the contact of sugar with the tip of the tongue, 1001 Taste, why do connoisseurs of wines hold wine in their mouths a few seconds when judging of it, 1002 Taste, why do they also pass the fumes of the wine through their nostrils, 1003 Tea-pot, why does a bright metal one produce better tea than a black earthenware, 200 LESSON LXXI. Tea-pot, if the earthenware one were set by the fire, why would it then make the best tea, 201 Tea, what is it, 1192 Tea, where is it cultivated, 1225 Tears, what is the cause of, 977 Temperature, why do some articles feel colder than others, 138 Temperature, why does it feel warmer after a frost has set in, 163 Tendons, what are they, 939 Tendons, why are they used to attach the muscles to the bones, 940 Teneriffe, what are the botanical regions of the Peak of, 1241 Thaumatrope, why do the figures on appear to dance, 869 Thaw, why is it colder when a thaw takes place, 164 Thermometer, what is the, 709 Thermometer, why does it indicate degrees of heat, 710 Thermometer, why are there Reaumur's and Fahrenheit's, 711 Thermometer and barometer, what is the difference, 712 Thermometer, in what season of the year does it vary most, 715 Thunder, what is it, 614 Thunder-peal, why is it sometimes loud and continuous, 616 LESSON LXXII. Thunder-peal, why is it sometimes broken and unequal, 617 Thunder-peal, why is it sometimes a low, grumbling noise, 618 Thunder-peal, why does it sometimes follow immediately after the flash of lightning, 620 Thunder, through what distance will the sound travel, 621 Thunderbolt, what is a, 628 Tinder-box, the history of a, 340 Toasting-fork, why has it a wooden handle, 124 Tops, why do they stand erect while they spin, but fall when they stop, 814 Tops, why do they "sleep", 816 Tops, why do they cease to spin, 817 Touch, in what part of the body is the sense of most perfect, 1005 Toxicologists, what are they, 61 Trap and ball, why is the ball propelled upward, when the trigger is struck, 866 Trees, what are the estimated ages of, 1214 Trees, what are the northern limits of, 1237 Trees, why are they covered with bark, 1270 LESSON LXXIII. Trees, why have those with large trunks a great number of leafy branches, 1274