The overwhelming effrontery of this demand caused the commander of the Scarabaeus to doubt whether he had to deal with a raving lunatic or a blustering fool; but he informed the person in charge of the flag-of-truce boat, that he would give him fifteen minutes in which to get back to his vessel, and that he would then open fire upon that craft. The men who rowed the little boat were not men-of-war's men, and were unaccustomed to duties of this kind. In eight minutes they had reached their vessel, and were safe on board. Just seven minutes afterward the first shot came from the Scarabaeus. It passed over Repeller No. 1, and that vessel, instead of replying, immediately steamed nearer her adversary. The Director-in-chief desired to determine the effect of an active cannonade upon the new armour, and therefore ordered the vessel placed in such a position that the Englishman might have the best opportunity for using it as a target. The Scarabaeus lost no time in availing herself of the facilities offered. She was a large and powerful ship, with a heavy armament; and, soon getting the range of the Syndicate's vessel, she hurled ball after ball upon her striped side. Repeller No. 1 made no reply, but quietly submitted to the terrible bombardment. Some of the great shot jarred her from bow to stern, but not one of them broke a steel spring, nor penetrated the heavy inside plates. After half an hour of this, work the Director-in-chief became satisfied that the new armour had well acquitted itself in the severe trial to which it had been subjected. Some of the air-buffers had been disabled, probably on account of faults in their construction, but these could readily be replaced, and no further injury had been done the vessel. It was not necessary, therefore, to continue the experiment any longer, and besides, there was danger that the Englishman, perceiving that his antagonist did not appear to be affected by his fire, would approach closer and endeavour to ram her. This was to be avoided, for the Scarabaeus was a much larger vessel than Repeller No. 1, and able to run into the latter and sink her by mere preponderance of weight. It was therefore decided to now test the powers of the crabs. Signals were made from Repeller No. 1 to Crab A, which had been lying with the larger vessel between it and the enemy. These signals were made by jets of dense black smoke, which were ejected from a small pipe on the repeller. These slender columns of smoke preserved their cylindrical forms for some moments, and were visible at a great distance by day or night, being illumined in the latter case by electric light. The length and frequency of these jets were regulated by an instrument in the Director's room. Thus, by means of long and short puffs, with the proper use of intervals, a message could be projected into the air as a telegraphic instrument would mark it upon paper.