22 



VASSAL AND BROCIIET. 



first time in November, 1905, on a hj'drograpliic mission; passed the year 1906 

 in Tonkin in tlie Bay of Halong, and came to the Cape Saint Jacques in Cochin- 

 China in January, 1907. 



The first case of dengue broke out on board the vessel while she was 

 stationed at Saigon, from May 14 to May 31, 1907. The patient, a 

 sailor, was nursed on board at Saigon from the 21st to the 28th of May. 



The Manche went directly from Saigon to Camranh. There were two 

 more cases on the 5th of June, on the 6th another, on the 7th two, and on 

 the 8th two more. In short, nearly everyone on the boat caught the 

 fever. On June 20, there were 32 patients ill at the same time. The 

 entries into the hospital succeeded one another as follows : 



Date. 



Number 



of 

 patients. 



Date. 



Number 



of 

 patients. 



May 21 



"1 

 "3 

 1 

 2 

 4 

 4 

 2 

 4 

 4 

 1 

 1 

 3 

 1 

 c4 



June 18 - 



4 

 6 



14 

 7 

 8 

 7 

 4 

 3 

 3 

 

 2 

 1 



June 5 



June 19 — _ 



June 6 



June 20 _ _ 



June 7 — — - 



June 21- — 



June 8 — 



June 22 



June 9 _- _ 



June 23 . . _ 



June ]0 - 



June 24 



June 11 



June 25 



June 12 



June 26 



June 13 _ 



June 27 



June 14 



June 28 _ 



June 15 



June 29 



June IP 



Total 



94 



June 17 - 







•At Saigon. 



•"At Camranh. 



= At Nhatrang. 



The crew of the Manche on June 1 consisted of 140 men, of whom 

 108 were Europeans and 32 natives of Annam. The following figures 

 show the proportion in which they were attacked: 





Europeans. 



Natives. 



Number. 



Patients. 



Number. 



Patients. 



Ofiicers 



14 

 10 



84 



10 

 10 



74 







Petty officers ._ . 







Sailors 



23 

 9 





 



Servants 



Total 







108 



94 



32 









The European crew with the exception of 6 men had arrived from France in 

 April, 1907. The sailors were for the most part young men between 20 and 23 

 years of age, never before having been in the Tropics. . .Ten officers had been in 

 service on the Manche since the second half of 1906; the other 4 since January, 

 1907. Nearly all the Annamese had been on board at least a year before the 

 Europeans came. 



