1877 Canvas bases 15 inches square were introduced.
Home plate was placed in the angle formed by the intersection of the first and third base lines.
The hitter was exempted from a time at bat if he walked.
1879 Player reserve clause was for the first time put into a contract.
The number of "called balls" became 9 and all balls were either strikes, balls or fouls.
The pitcher had to face a batsman before pitching to him.
A staff of umpires was first introduced.
1880 Base on balls was reduced to 8 "called balls."
The base runner was out if hit by a batted ball.
The catcher had to catch the pitch on the fly in order to register and out on a third strike.
1883 The "foul bound catch" was abolished and the pitcher could deliver a ball from above his waist.
1884 All restrictions on the delivery of a pitcher were removed.
Six "called balls" became a base on balls.
Championships were to be decided on a percentage basis.
1885 One portion of the bat could be flat (one side).
Home base could be made of marble or whitened rubber.
Chest protectors worn by catchers and umpires came into use.
1887 The pitcher's box was reduced to 4 feet by 5 1/2 feet.
Calling for high and low pitches was abolished.
Five balls became a base on balls.
Four "called strikes" were adopted for this season only.
Bases on balls were recorded as hits for this season only.
The batter was awarded first base when hit by a pitch.
Home plate was to be made of rubber only - dropping the marble type and was to be 12 inches square.
Coaches were recognized by the rules for the first time ever.
1888 Player reserve clause was written into the contracts of minor leaguers for the first time.
The base on balls exemption from a time at bat was restored.
A batsman was credited with a base hit when a runner was hit by his batted ball.
1889 Four balls became a base on balls.
A sacrifice bunt was statistically recognized.
1891 Substitutions were permitted at any point in the game.
Large padded mitts were allowed for catchers.
1893 Pitching distance increased from 50 feet to 60 feet 6 inches.
The pitching box was eliminated and a rubber slab 12 inches by 4 inches was substituted.
The pitcher was required to place his rear foot against the slab.
The rule exempting a batter from a time at bat on a sacrifice was instituted.
The rule allowing a flat side to a bat was rescinded and the requirement that the bat be round and wholly of hard wood was substituted.
1894 Foul bunts were classified as strikes.
1895 Pitching slab was enlarged to 24 inches by 6 inches.
Bats were permitted to be 2 3/4 inches in diameter and not to exceed 42 inches.
Infield-fly rule was adopted.
A held foul tip was classified as a strike.