# Quaternion Society

The Quaternion Society was a scientific society, self-described as an "International Association for Promoting the Study of Quaternions and Allied Systems of Mathematics". At its peak it consisted of about 60 mathematicians spread throughout the academic world that were experimenting with quaternions and other hypercomplex number systems. The group's guiding light was Alexander Macfarlane who served as its secretary initially, and became president in 1909. The association published a Bibliography in 1904 and a Bulletin (annual report) from 1900 to 1913.
The Bulletin became a review journal for topics in vector analysis and abstract algebra such as the theory of equipollence. The mathematical work reviewed pertained largely to matrices and linear algebra as the methods were in rapid development at the time.

## Genesis

In 1895, Professor P. Molenbroek of The Hague, Holland, and Shinkichi Kimura studying at Yale put out a call for scholars to form the society in widely circulated journals: Nature, Science, and the Bulletin of the American Mathematical Society. Giuseppe Peano also announced the society formation in his Rivista di Matematica.
The call to form an Association was encouraged by Macfarlane in 1896:
    The logical harmony and unification of the whole of mathematical analysis ought to be kept in view. The algebra of space ought to include the algebra of the plane as a special case, just as the algebra of the plane includes the algebra of the line…When vector analysis is developed and presented...we may expect to see many zealous cultivators, many fruitful applications, and, finally, universal diffusion ... May the movement initiated by Messrs. Molenbroek and Kimura hasten the realization of this happy result.
In 1897 the British Association met in Toronto where vector products were discussed:
    Professor Henrici proposed a new notation to denote the different products of vectors, which consists in using square brackets for vector products and round brackets for scalar products. He likewise advocated adoption of Heaviside’s term "ort" for vector, the tensor of which is the number 1. Prof. A. Macfarlane read a communication on the solution of the cubic equation in which he explained how the two binomials in Cardano’s formula may be treated as complex quantities, either circular or hyperbolic, all the roots of the cubic can then be deduced by a general method.
Also that year, L. van Elfrinkhof described rotations in 4-dimensional Euclidean space.
A system of national secretaries was announced in the AMS Bulletin in 1899: Alexander McAulay for Australasia, Victor Schlegel for Germany, Joly for Great Britain and Ireland, Giuseppe Peano for Italy, Kimura for Japan, Aleksandr Kotelnikov for Russia, F. Kraft for Switzerland, and Arthur Stafford Hathaway for the USA. For France the national secretary was Paul Genty, an engineer with the division of Ponts et Chaussees, and a quaternion collaborator with Charles-Ange Laisant, author of Methode des Quaterniones (1881).
Victor Schlegel reported on the new institution in the Monatshefte für Mathematik.

## Officers

When the society was organized in 1899, Peter Guthrie Tait was chosen as president, but he declined for reasons of poor health.
The first president was Robert Stawell Ball, and Alexander Macfarlane served as secretary and treasurer. In 1905 Charles Jasper Joly took over as president and L. van Elfrinkhof as treasurer, while Macfarlane continued as secretary. In 1909 Macfarlane became president, James Byrnie Shaw became secretary, and van Elfrinkhof continued as treasurer. The next year Macfarlane and Shaw continued in their posts, while Macfarlane also absorbed the office of treasurer. When Macfarlane died in 1913 after nearly completing the issue of the Bulletin, Shaw completed it and wound up the association.
The rules state that the president had the power of veto.

## Bulletin

The Bulletin of the Association Promoting the Study of Quaternions and Allied Systems of Mathematics was issued nine times under the editorship of Alexander Macfarlane. Every issue listed the officers of the Association, governing council, rules, members, and a financial statement from the treasurer. Today HathiTrust provides access to these publications that are mainly of historical interest:
* March 1900 Published in Toronto by Roswell-Hutchinson Press.
* March 1901 Published in Dublin at the University Press. President Charles J. Joly address.
* March 1903, Dublin. Macfarlane announces Bibliography.
* April 1905, Dublin. President C.J. Joly address.
* March 1908 Published in Lancaster, Pennsylvania, by New Era Printing. J.B. Shaw reports on bibliographic supplement.
* June 1909, Lancaster. President Macfarlane address on notation.
* October 1910, Lancaster. J.B. Shaw challenged by "inclusion or exclusion of certain papers which are only remotely connected with the theory of operations in the abstract."
* June 1912, Lancaster. Obituary: Ferdinand Ferber. "Comparative Notation for Vector Expressions" by J.B. Shaw. President Macfarlane address citing Duncan Sommerville's comments.
* June 1913, Lancaster. Secretary Shaw reports the death of A. Macfarlane and G. Combebiac.