From The Horsewoman, by Alice M. Hayes, published in 1903:
"WHEN LADIES BEGAN TO HUNT.
Although the hunting field is nowadays graced by the presence of many good horsewomen who ride well to hounds and are capable of taking care of themselves and their mounts, it is only within about the last seventy years that ladies have ridden across country. Mr. Elliott in his book Fifty years of Fox-hunting tells us that in 1838 “Mrs. Lorraine Smith and her two daughters, with Miss Stone from Blisworth, were the only ladies who hunted then. The Misses Lorraine Smith rode in scarlet bodices and grey skirts. The improved side-saddle was not then invented to enable a lady to ride over fences.” We learn from the same writer that in 1841 “a lady named Miss Nellie Holmes was out, topping the fences like a bird to the admiration of all; and[305] when she came to the brook, over she went… That was the first lady whom I saw go over a country. There is one certainty about ladies, what one does another will do, if it be worth the doing. Very soon others were at the game, and many have played it well since.” In a pleasant little book entitled The Young Ladies’ Equestrian Manual, written by a lady and published in 1838, we read, “No lady of taste ever gallops on the road. Into this pace the lady’s horse is never urged, or permitted to break, except in the field; and not above one among a thousand of our fair readers, it may be surmised, is likely to be endowed with sufficient ambition and boldness, to attempt the following of hounds.” The saddle given in a drawing in this book has no leaping head, but the writer mentions, as I have previously noted, that movable crutches were being introduced to enable a lady to ride on either side of her horse. The leaping head, third crutch, or third pommel, as it was first called in England, came into use in this country in the forties, and with its aid ladies felt themselves endowed with sufficient ambition and boldness to follow hounds. Captain Elmhirst, writing in 1877, says: “It will, I think, be admitted by everyone that the number of ladies who hunt now is at least tenfold as compared with a dozen years ago,” and every year since that was written, has seen a steady increase in the ranks of hunting women."
It is an excellent book. I have a copy, but you can read it online here: http://www.sidesaddle.com/reference_pages/The%20Horsewoman,%20by%20Alice%20M_%20Hayes.htm