 Professor Gibbs produced an 85-page outline of his treatment of vectors for use by his students and had sent a copy to Oliver Heaviside in 1888.In 1892 Heaviside, who was formulating his own vectorial system in the "Transactions of the Royal Society", praised Gibbs' "little book", saying it "deserves to be well known".However, he also noted that it was "much too condensed for a first introduction to the subject".