'Well, apparently Jamieson's diagnosis of his brother's trouble had been perfectly correct, and the rest-cure had been applied none too soon. Within two or three days the frail, suntanned doctor developed a raging enteric fever, and it was plain that had he not taken to his bed when ordered the fever might well have knocked him down for good. His condition added considerably to the strenuous work already being done by his brother and the hospital's two trained native nurses. For you see, Dawson, David Jamieson's fever had not confined itself to him. This particularly nasty disease had been busy in the marshlands of the Okavango Basin, just across the narrow neck of Lake Ngami, since a time almost a week prior to thee English doctor's arrival; and in ones- and twos canoes containing sick natives had been crossing the lake to the hospital for some ten days.
'So things went for the first three weeks, and David Jamieson slowly recovered from his fever and began to put on weight again in his hospital bed. With most of the natives back on their feet and returned across the lake to their marshland villages, Dr Maurice Jamieson found he had a little more time to himself.
'Now the doctor had a- hobby; he was something of an entomologist. Naturally, when first he decided to go out to his brother in Africa, he had seen the trip as a marvellous opportunity to add some tropical specimens to his collection. To this end he had taken with him certain items of entomological kit; tweezers and a butterfly-net, name-cards and a notebook -- and, most important of all, a set of variously-sized moulds and the quick-drying artificial resin with which to fill them.
'This simple system was better by far than the old method of preservation and mounting, and the specimens thus encased could be examined minutely from all angles. Indeed, they were trapped as firmly as those prehistoric flies in- amber which you can find in most museums, and when the resin was set it was as dear and hard as glass.
'In the evenings, when his work was done and the remaining patients had been properly bedded down for e night, Maurice Jamieson would get out into the large, enclosed gardens of the hospital and lose himself to the doubtless delightful diversions of "bug-hunting". He collected and categorized specimen after specimen, until the time came when his brother was almost well enough to be up and about again . . Which was when the trouble started.
'You see, some of the natives effectively treated at the hospital had been M'bulus, possibly the most unfriendlyand 'uncivil; zed" of the local tribes, and hitherto the had never bothered to take their troubles to the "white Mganga" . Their own Mganga, Darghud the witch-doctor, had always treated their ailments himself — and allegedly he was a man as well versed in native medicine as he was in Black Magic. This enteric disease, though, patently had the witch-doctor foxed. For a long time the chief of the M'bulus, Notka, who had long studied the benefits reaped by the other tribes, had been pressing for good relations with the hospital. Now Notka himself had gone down with the enteritis, against which Darghud's ministrations seemed of no earthly use. So the chief sent his eldest son and the Mganga Darghud across the lake to bring back some of the potent medicine of David Jamieson.
'Now this was the problem: David Jamieson, before his brother's arrival, had discovered the best treatment for the virulent enteric disease to be penicillin — with the result that only two shots of the medicine remained in the hospital's dispensary. Maurice Jamieson intended lo use those shots on his brother, to finalize David's treatment, and he had one of the nurses explain the facts to the bone-rattling Mganga and to chief Notka's anxious
'Picture it, Dawson: Darghud, the painted savage, the witch-doctor, sent like a messenger-boy by his chief, against his own wishes and heathen judgment, to beg healing juju from the white Mgangas — only to be perfunctorily refused and turned away! It was too much. Much more than that, however, it was the chance Darghud had been waiting for; the opportunity to defame the white men, the Great Mgangas, and perhaps even get rid of them!
'There in the hospital grounds, in front of the chief's son, Darghud puffed himself up in black rage, spitting on the ground at Maurice Jamieson's feet and flinging an itchy white powder in the face of the nurse-cum interpreter. Before the astonished doctor could recover from his surprise (remember, Dawson, that to him the choice had been a simple, logical one; two shots could hardly help chief Notka across the lake, they wouldn't provide a sufficiently large dosage, but they were absolutely necessary in the completion of his brother's recovery), the Mganga passed him a great, wriggling beetle. Then Darghud stalked away, his two cringing, servile companions — the paddlers of his canoe — close on his heels.
'The black interpreter, when he'd managed to get the white powder out of his eyes, backed hurriedly away as soon as he saw the object of Dr Jamieson's puzzled scrutiny — the squirming, chitinous creature that he held in his hand — Darghud's great beetle!
'When Jamieson questioned the black's concern, he was told that the beetle was a "bad charm", designed to bring down evil on the person of its receiver. He advised the doctor to throw the thing far, far away — and then to pray most earnestly to God. Maurice Jamieson laughed at the suggestion, remarking that the beetle was of a sort he'd never seen before, and that he was certainly not going to throw it away; however, the nurse, by all means, could pray for him if he wished! Then he immediately went to his room and placed the beetle in a mould, pouring thick resin from a freshly opened bottle over its wriggling form. He left the whole to set and thought no more about it . . . until later.
'That evening, as usual, when the last few patients had been attended to for the night, Jamieson went into the gardens and had a look under the bushes to see if he could find any new bugs worth adding to his collection. His usual enthusiasm was lacking, however (a bit of a headache), and besides, there was that disturbing, rhythmic drumming from over the lake ..
'When he went back to his room his first thought was of the beetle, the fetish-creature given him by Darghud. But the solid, clear-resin block in which the thing should now have lain dead and immobile, perfectly preserved and displayed forever, was barren of any sign of the insect! The only solution, the only answer to the puzzle, seemed to Jamieson to be that the beetle had somehow struggled out of the mould before the resin was properly set; something unprecedented in his experience. On the other hand (he told himself), it could be that the new bottle of resin was inferior, perhaps affected by the heat. After all, the stuff had been produced for use in rather cooler climes. The next morning, though, Jamieson did notice-that all his other new specimens, locked in resin from the same bottle, had set as perfectly as any he ever treated in England.
'Three days later — during which time, incidentally, that unusual headache of Jamieson's, first felt on the evening of the beetle's disappearance, had -constantly nagged him — his brother was up and about again. David Jamieson was paler than before, but chirpy and a lot more energetic, and so his bug-collecting brother decided it was time he took leave of the place. The heat seemed to be bothering him more and more likewise, day and night, the insistent throb of drums from over the lake; his original enthusiasm for his brother's practice and the obscurity of the lakeside hospital had drastically fallen off. He put it all down to too much sun, and on the fourth morning after Darghud's visit he climbed back into the passenger seat of his guides landrover to begin the long ride back to Livingstone. Five days later he was back in "Blighty"...
'Now I've explained, Dawson, how Dr Jamieson believed his continuing headache to be due to an overdose of the African sun; but why should the thing continue so persistently — worsening, in fact — in England? And ordinary remedies seemed of no use whatsoever.'