426 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



October 31st.— Spring tides. Wind, W.S.W. strong. 

 Frequent severe squalls. Three-and-a-half hours after 

 high tide we released two floats at a point opposite the 

 sewer, and about 20 yards from its mouth. This was 

 really too far out, but we wanted to give the floats every 

 chance of clearing the wharf. As a matter of fact, both 

 skirted the piles very closely, and took a line in direct 

 continuation of the line of the pier, as shown on the map, 

 eventually touching the ground at the point shown. 

 Current running about 1J miles per hour. 



November 1st. — Spring tides. Wind, S. light. 

 Speed of current 2J miles per hour. A float and a bottle 

 were released on 2\ hours' ebb somewhat closer in than 

 on the preceding day, at a point where the stream of 

 sewage would likely be deflected. Both made straight 

 for the wharf where they eddied about around the piles 

 for 15 minutes or so, eventually getting free, and taking 

 the same line as before, and going aground on the same 

 spot. While watching these floats, I noticed a little 

 further up the shore the two I had released the day before, 

 which, no doubt, had been carried up the river by the 

 flood, and brought down again by the ebb. This point 

 seems to be of importance, and I will refer to it again in 

 my summary. 



November 5th. — Neap tides. Wind, W.N.W. 

 moderate. Speed of current about \ mile per hour. We 

 released a float on the flood tide 1^ hours before full. 

 It passed within 100 feet of the wall of the Literary 

 Institute, and about the same distance from Penhelyg 

 Police Station. The stream from the sewer was quite 

 noticeable, there being evidently some oily matter present; 

 the gulls, too, generally afford a good indication as to its 

 whereabouts. Opposite Penhelyg the float was making 

 but very little progress, the tide being by this time about 

 slack, and we abandoned it. 



