1856 Lancing College created its own code of association football which was regarded as a means of fostering teamwork. "Scientific" football is first described in 1862 at Rugby School: here one could see "scientific play", magnificent "drops" and "gallant run ins". It is uncertain if the drops and run-ins constituted what the author meant by "scientific", however it is made clear that this playing style was distinctly less "vicious" than in the past. Clearly there was something systematic about scientific rugby. Further references to scientific play come in match accounts in the 1860s, including to games under the Association rules. Certain association football historians correctly point out that the forward pass is not permitted in rugby football and therefore see the emergence of the forward pass as a critical development in the evolution of association football (and for this reason do not acknowledge the role of the public school games). They forget, however, that passing the ball forward by kicking is not only completely legal in Rugby but also is a regular tactic employed in most matches—particularly in open, running play. For this reason the public school games can claim to be origin of the forward-passing game. Passing the ball continues to this day in surviving traditional public school association football games. Even in Harrow Football, which is essentially a dribbling game, the ball may be chipped into the hands of a team-mate. Most notably the "Combination game" (the predecessor of the modern style of association football involving a lot of player to player passing) is believed to have been invented by the Royal Engineers A.F.C. in the early 1870s. Nearly all of these players were from English public schools. Kicking off from the centre This was a key feature of the football codes of Harrow and Rugby. Goal crossbar The cross bar to the association football goal was a feature of the Eton game and was noteworthy as the ball had to pass under the bar (instead of over it, as in Rugby football). The Sheffield Rules of 1862 later included both crossbars and half time and free kicks were introduced to their code in 1866 or before. In Harrow football, however, there is no crossbar, quite literally two rugby posts without their crossbar. A base is scored when the ball is hit between the posts. Team size Eleven or fifteen players per side was a feature of association