I have in another place mentioned the influence of the weather upon the symptoms of this disease. In addition to the facts which have been formerly recorded, I shall add one more from Dr. Desportes. He tells us, that in dry weather the disease affects the head, and that the bowels in this case are more obstinately costive than in moist weather. This influence of the atmosphere on the yellow fever will not surprise those physicians who recollect the remarkable passage in Hippocrates, in which he says, that in the violent heats of summer, fevers appeared, but without any sweat; but if a shower, though ever so slight, appeared, a sweat broke out in the beginning[104]. I observed further, that a vomiting rarely attended those cases in which there was an absence of a chilly fit in the beginning of the fever. The same observation is made by Dr. Desportes[105]. [104] Epidemics, book XI. sect. I. [105] Les Maladies de St. Domingue, vol. I. p. 193. The matter discharged by vomiting was green or yellow bile in most cases. Mrs. Jones, the wife of Captain Lloyd Jones, and one other person, discharged black bile within one hour after they were attacked by the fever. I have taken notice, in the History of the Yellow Fever of 1793, that a discharge of bile in the beginning of this fever was always a favourable symptom. Dr. Davidson of St. Vincents, in a letter to me, dated the 22d July, 1794, makes the same remark. It shows that the biliary ducts are open, and that the bile is not in that viscid and impacted state which is described in the dissections of Dr. Mitchel[106]. A distressing pain in the stomach, called by Dr. Cullen gastrodynia, attended in two instances. A burning pain in the stomach, and a soreness to the touch of its whole external region, occurred in three or four cases. Two of them were in March, 1795. In Mrs. Vogles, who had the fever in September, 1794, the sensibility of the pit of the stomach was so exquisite, that she could not bear the weight of a sheet upon it. [106] Account of the Yellow Fever of 1793. Pains in the bowels were very common. They formed the true bilious colic, so often mentioned by West-India writers. In John Madge these pains produced a hardness and contraction of the whole external region of the bowels. They were periodical in Miss Nancy Eyre, and in Mrs. Gardiner, and in both cases were attended with diarrh[oe]a. Costiveness without pain was common, and, in some cases, so extremely obstinate as to resist, for several days, the successive and alternated use of all the usual purges of the shops. Flatulency was less common in this fever than in the year 1793. The disease appeared with symptoms of dysentery in several cases. IV. The following is an account of the state of the _secretions_ and _excretions_ in this fever.