This section is from the book "Hill's Manual Of Social And Business Forms: A Guide To Correct Writing", by Thos. E. Hill. Also available from Amazon: Hill's Manual Of Social And Business Forms: The How-To-Do-Everything Book Of Victorian America.
A gentleman who may act as escort for a lady when riding should be very careful that the horse selected for her is entirely reliable and gentle. If he has no horse of his own, and she has none to which she is accustomed, he must understand that there is considerable danger in allowing her to use a horse that has not been tried, no matter what may be the representations of the liverymen or servant.
A trustworthy horse having been secured for the lady, it is the gentleman's duty before mounting to give a very thorough examination of the saddle and bridle, to see that all are secure. It will not do to leave this matter to the stable-men. They are accustomed to such continuous handling of harness that they become careless, and are liable to overlook defects in buckles, girths, etc., that might cause a severe accident.
When all is in readiness, it is the gentleman's province to assist the lady in mounting. To do this, it is well to have some one hold the horse, otherwise he holds the bridle with his left hand. The lady, then, with her skirt in her left hand, will take hold of the pommel of the saddle with her right, her face turned towards the horse's head. The gentleman will stand at the horse's shoulder, facing the lady, and stoop, allowing her to place her left foot in his right hand. She will then spring, while he lifts her gently and steadily into her seat, following which he will place her left foot in the stirrup and arrange her riding habit After the lady is in position, the gentleman will still remain with her until she has whip and reins properly in hand and is securely in her seat, when he will mount his horse and take his place (Fig. 18) upon her right, as shown in the accompanying illustration.
Should there be two ladies on horseback, the gentleman should ride to the right of both of them, unless they may need his assistance, in which case he will ride between them.
In dismounting, the gentleman should take the lady's left hand in his right remove the stirrup and take her foot in his left hand, lowering her gently to the ground.