130 PHILOSOPHICAL TRANSACTIONS. [aNNO 1777- 



them separately into different vases, he found that, after a certain number of 

 days, they fixed themselves, and in less than three months became furnished 

 with limbs, &c. 



In observing the progress of such fragments as had been left naturally, or 

 from the bases of such anemonies as had moved from their place, he noticed, 

 that some fragments produced several small anemonies, which sometimes have 

 remained united for a considerable time, while others have soon separated. 

 These experiments were principally made during the winter season. 



N. B. In conducting such experiments it is necessary that the seawater the 

 animals are kept in be clear, and frequently renewed. ; 



VIII. ExperimenU and Observations in Electricity. By Mr. William Henley, 



F.R.S. p. 85. 



The most useful parts of these observations may be consulted in Cavallo's 

 Electricity, in 1 vols. 8vo. 



IX. Extract of a Letter from Jno. Strange, Esq., His Majesty s Resident at Ve- 

 nice, to Sir John Pringle, Bart., P. R. S. : with a Letter to Mr. Strange 

 from the Ahbe Joseph Toaldo, Professor in the University of Padua, &c. 

 giving an Account of the Tides in the Adriatic, p. 144. From the Latin, 

 dated Patavi, Nov. Q, 1776- 



Sig. Toaldo's account of these tides is here said to be grounded on the obser- 

 vations of a very accurate person at Venice, a Sig. Temanza, a celebrated archi- 

 tect and engineer. The first material observation is, that at Venice, it is high 

 water at 10-tV hours after the moon's passage over the meridian, either above or 

 below the horizon, on the day of the full or change. Then, as to the height 

 of the tides, it is observed that, at new and full moon, they will rise 3 or 3-|. 

 feet, seldom 4, and very seldom 6 or 7, and that only when the waters are urged 

 by a south wind. But that about the quarters the rise of the tide is much less, 

 being sometimes hardly 3 inches ; but at a medium about l6 inches. Tiiat the 

 tides in other parts of the Mediterranean are still less, being indeed hardly at all 

 perceptible, except in straits and bays. That on the first turn of the tide, the 

 rise is very slow and gradual for the first 3 or 4 hours, so as hardly to rise 3 

 inches per hour ; but afterwards it rises with a very rapid and violent motion ; 

 then, after being still for about half an hour at the top, it descends again in a 

 reverse manner. 



It is observed that generally the tides are a little higher in winter than in 

 summer. Thus, the medium height of all the tides in the 6 winter months, in 

 the 5 years 1751, 2, 3, 4, 5, was 2 ft. -f an inch ; and the medium of all the 

 tides in the 6 summer months of the same years, was I (t. 9.7 inches. It fur- 



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