At 3.40 this morning heavy firing started, and it continued for half an hour; soon after we heard aeroplanes; there were two Austrian ones which came over dropping bombs. They flew over this hospital many times. The Serbs started firing at them, and the shrapnel fell on the road below, quite a lot of it. If I had been all right I should have got some. The aeroplanes now have dropped a lot of sealed packets with long silvery ribbon which floated along for many miles in the air; it was quite nice to see them in the sun. We have just heard that the long silver ribbon contained a sealed packet addressed to the governor of Belgrade, saying that unless the Serbians surrender they will start bombarding the town. It is the anniversary of the declaration of war on Serbia to-day. I have just had three more months' extension of leave from the Governors of the Institute, saying they have appreciated all the valuable work I have been doing, and have granted me another three months' leave, from the commencement of next session. THE BRITISH FEVER HOSPITAL, BELGRADE, SERBIA, Friday, _July 23, 1915._ Six of our unit arrived over from the camp to say good-bye to us; they were returning to England; they wanted to see Belgrade before returning. A few guns were fired at Semlin by the Serbs. It is splendid to see the way the Serbian women work. Some of the work-rooms at the arsenal were full of them, and even little boys and girls of fourteen and fifteen years of age. When the bullets and cartridges are finished they are tested in another machine, and if they have any defects they are shot out again. The Austrian kitchens are considered wonderful, they are so well fitted up. Saturday, _July 24, 1915._