Show soend tho following curlon ot sound have been carefully verified by an extended series ol 01 tho whistle 0 n locomotive is lidard yards the no ro of a railroad train 2 floo alio report of a musket and tho bark of a dog 1800 in orchestra or alio roll of a drum agoo tho human to 1 distance of 1000 tho croaking of frogs alio chirping of chickens distinct speaking is heard in tho nir froni lolow up to a dh tanco of COO yard from alioto it la only understood to a nin 0 o of yards downward down waid it has been ascertained that an echo ia well reflected from tho surface of smooth water only when tho voice chinca from nn elevation other similar phenomena connected with tho transmission tran mission of sound bavo been ob lull alo results disagree froni inaccuracy in tho observations or from alio varying nature of alio circumstances affecting tho numbers obtained such variations to an extent of ten to twenty per cent and oven more tho weather being cold and dry or warm and wet arc alio chief causes in the first anso tho anund booi to a greater and in the second to atosa cr distance |