He gave them much practical and therefore valuable advice to guide them in whatever emergencies might arise, and this was conveyed in the whimsical, half humorous manner that seemed characteristic of him.

At first Gys had shrunk involuntarily from facing this bevy of young girls, but they had so frankly ignored his physical blemishes and exhibited so true a comradeship to all concerned in the expedition, that the doctor soon felt perfectly at ease in their society.
During the evenings he gave them practical demonstrations of the application of tourniquets, bandages and the like, while Uncle John and Ajo by turns posed as wounded soldiers.

Gys was extraordinarily deft in all his manipulations and although Maud Stanton was a graduate nurse--with little experience, however--and Beth De Graf had studied the art for a year or more, it was Patsy Doyle who showed the most dexterity in assisting the doctor on these occasions.
"I don't know whether I'll faint at the sight of real blood," she said, "but I shall know pretty well what to do if I can keep my nerve." The application of anaesthetics was another thing fully explained by Gys, but this could not be demonstrated.

Patsy, however, was taught the use of the hypodermic needle, which Maud and Beth quite understood.
"We've a big stock of morphia, in its various forms," said the doctor, "and I expect it to prove of tremendous value in comforting our patients." "I'm not sure I approve the use of that drug," remarked Uncle John.
"But think of the suffering we can allay by its use," exclaimed Maud.
"If ever morphia is justifiable, it is in war, where it can save many a life by conquering unendurable pain.

I believe the discovery of morphine was the greatest blessing that humanity has ever enjoyed.