Sometimes there were as many as twenty in the student-band, but somewhere in the country a new church would open, and the brightest of the class would be called away to be its minister. But just as often a young Christian would come to the missionary and ask if he too might not be trained to preach the gospel of Jesus Christ.
Whether at home or abroad, pupils and teacher had to resort to all sorts of means to get away for an uninterrupted hour together. For Kai Bok-su was always in demand to visit the sick or sad or troubled.
There was a little kitchen separate from the house on the bluff, and over this Mackay with his students built a second story. And here they would often slip away for a little quiet time together. One night, about eleven o'clock, Mackay was here alone poring over his books. The young men had gone home to bed except two or three who were in the kitchen below. Some papers had been dropped over a pipe-hole in the floor of the room where Mackay was studying, and for some time he had been disturbed by a rustling among them. At last without looking up, he called to his boys below: "I think there are rats up here among my papers!"
Koa Kau, one of the younger of the students, ran lightly up the stairs to give battle to the intruders. What was his horror when he saw fully three feet of a monster serpent sticking up through the pipe-hole and waving its horrible head in the air just a little distance from Kai Bok-su's chair.
The boy gave a shout, darted down the stair, and with a sharp stick, pinned the body of the snake to the wall below. The creature became terribly violent, but Koa Kau held on valiantly and Mackay seized an old Chinese spear that happened to be in the room above and pierced the serpent through the head. They pulled its dead body down into the kitchen below and spread it out. It measured nine feet. The students would not rest until it was buried, and the remembrance of the horrible creature's visit for some time spoiled the charm of the little upper room.
The rocks at Kelung harbor were another favorite spot for this little traveling university to hold its classes. Sometimes they would take their dinner and row out in a little sampan to the rocks outside the harbor and there, undisturbed, they would study the whole day long.
They always began the day's work with a prayer and a hymn of praise, and no matter what subjects they might study, most of the time was spent on the greatest of books. After a hard morning's work each one would gather sticks, make a fire, and they would have their dinner of vegetables, rice, and pork or buffalo-meat. Then there were oysters, taken fresh off the rocks, to add to their bill of fare.
At five in the afternoon, when the strain of study was beginning to tell, they would vary the program. One or two of the boys would take a plunge into the sea and bring up a subject for study,—a shell, some living coral, sea-weed, sea-urchins, or some such treasure. They would examine it, and Kai Bok-su, always delighted when on a scientific subject, would give them a lesson in natural history. And he saw with joy how the wonders of the sea and land opened these young men's minds to understand what a great and wonderful God was theirs, who had made "the heaven and the earth and the sea, and all that in them is."
When they visited a chapel in the country, they had a daily program which they tried hard to follow. They studied until four o'clock every afternoon and all were trained in speaking and preaching. After four they made visits together to Christians or heathen, speaking always a word for their Master. Every evening a public service was held at which Mackay preached. These sermons were an important part of the young men's training, for he always treated the gospel in a new way. A Hoa, who was Mackay's companion for the greater part of sixteen years, stated that he had never heard Kai Bok-su preach the same sermon twice.
On the whole the students liked their college best when it was moving. For on the road, while their principal gave much time to the Bible and how to present the gospel, he would enliven their walks by conversing about everything by the way and making it full of interest. The structure of a wayside flower, the geological formation of an overhanging rock, the composition of the soil of the tea plantations, the stars that shone in the sky when night came down upon them;—all these made the traveling college a delight.