206 



19 flies only, almost the whole of them from one plantation, whereas, 

 in the corresponding month of the previous year 139 men captured 

 21,434. In the month of January 1914, the number of fresh cases 

 of trypanosomiasis was only three, and two of these have resided for 

 six years and seven months in the island, and it is supposed that these 

 labourers had been infected some time previously, though the previous 

 examination of their blood had given negative results. The other 

 fresh case is that of a man from Cape Verde who had resided two years- 

 in the island. The report for February and March 1914 shows the 

 steady diminution in flies caught. In these months of 1913, 173 men 

 caught 11,865 and 9,450 respectively whilst on the most infested 

 plantation 38 men succeeded in catching only one fly in the month of 

 March 1914, and it is hoped that when this particular plantation is 

 cleared of the few pigs remaining the fly will disappear also. In 

 April only one fly was caught in the Sundi plantation previously 

 famous as a breeding place, and during May and June none could be 

 found, and it is noted that whilst more than 92,000 flies were caught 

 in the first six months of 1911 the total catch, with a very much larger 

 number of labourers, for the same period of 1914, was only 34. In 

 order to obtain information from the largest possible number of sources- 

 the mission offered a reward of about 4s. each for every fly alive or 

 recently dead, and notice of this was distributed all over the island 

 pubhcly. At the end of the month no one had claimed the reward, 

 the only flies caught since the beginning of the year were practically 

 all from the northern part of the island, that is to say that part where 

 the sanitary works could only be completed last April, and there is 

 conclusive evidence that the disappearance of the fly has followed 

 pari JMSSU the carrying out of these works. 



The total number of fresh cases discovered in the island from October 

 1913 to June 1914 was 19, and of these 10 had resided more than 

 three years in the island, seven between two and three years and only 

 one less than one year, and the Mission has come to the conclusion 

 that, save in the rarest instances, infection cannot have occurred in 

 the island since June 1913, and there is no reason to suppose that 

 any case of infection has occurred since January 1914. 



In a letter dated 3rd October 1914, received by Sir Edward Grey 

 from the Portuguese Minister for Foreign affairs, it is stated that the 

 Governor of San Thome has reported by telegram the complete 

 extinction of sleeping sickness in the Island of Principe. Four fresh 

 cases of animal trypanosomiasis have been discovered in oxen, two 

 known to have been imported from Benguella and a third from Cape 

 Verde, though the animal originally came from Guinea, and Dr. Da 

 Costa is of opinion that these were already infected when imported. 

 The fourth animal had been eight years on the island and the trypano- 

 some found in its blood is of a form which has not been reported in 

 Principe and this animal had always been on the part of the island 

 which has never been infested by fly. 



The success of the operations is shown by the summary 

 appended :— Over 203,000 flies were caught in 1912, 197,000 and 

 over in 1913, and only 34 during 1914. 



