290 PHILOSOPHICAL TRANSACTIONS. [anNO 1668# 



disturbing the efFervescence of the blood, as well as their power and virtue 

 when they are tempered together in a due proportion, to cause a regular 

 motion in the blood, and to convert meat into good nourishment : also about 

 the change of the chyle into blood, and where that change is begun, where 

 advanced, and where perfected : concerning the alteration made in the whole 

 body of animals by the spermatic aura, as to their voice, fatness, sweetness, 

 &c. About respiration, and how that may cease for a while in syncope and 

 hypochondriacal suffocations without death ; concerning sneezing, the hiccup, 

 yawning, and their causes : the alteration which the blood of the left ventricle 

 receives in the lungs by the inspired air, and the saliva or some other glandu- 

 lous liquor : of the pulse ; of the plenty of animal spirits and its cause ; of the 

 return of feverish fits by intervals, together with the cause thereof, &c. 



Tides observed in Hong-Road, four Miles from Bristol. By Captain 

 Samuel Sturmy. N'^1, p. 813. 



I have observed that our annual spring tides happen in March and Septem- 

 ber, either at the tide next before the sun's ingress into the equinoctial points 

 of Aries and Libra, or the next tide after, according as the moon is then near 

 her full or change : and then it rises in height about 7-i- fathoms, or 45 feet ; 

 the lowest neap-tides rising in height 25 feet. We observe also, that the 

 lowest neap makes the highest spring, unless the north-east winds, by blowing 

 hard, keep back the tides ; and the contrary winds (south-west) if they blow 

 hard, make here the highest. Concerning our diurnal tides, we observe, that 

 from about the latter end of March till the latter end of September, they are 

 about 1 foot 3 inches higher in the evening than in the morning; that is, 

 when high water happens after the sun is past the meridian, or in the tides be- 

 tween noon and midnight : But from Michaelmas till Lady-day we find the 

 contrary, the day tides being in that season higher by 15 inches than the night 

 tides, or the tides between midnight and noon. And this proportion holds in 

 both, after the gradual increase of the tides from neap to the highest spring, 

 and the like decrease of their height till neap again. As for the highest men- 

 strual spring-tide, it is always the third after the full moon or change-day, if it 

 be not kept back by north-east winds. I have observed several times, that it 

 flows here on the change-day, when the moon is east-south-east, the tide flow- 

 ing in for the space of 5 hours, and ebbing 7 hours. There is some difference 

 in reckoning the tides by the moon's bearing on such a point of the compass, 

 on the full or change-day ; for about that time only will the rule hold good. 

 But from the change to the quarters, and from the full to the quarters again in 



