186 EFFECTS OF FORESTS ON SPRINQB AND EIVEBS. 



mfetres at twenty-five different stations on the river on several occasions 

 of very low water. 



2. Of observations on the Vistula, with a tabulated statement of the 

 highest and lowest levels, observed at Weichsel near Kurzebrack in 

 each year from 1809 to 1871, with calculated mean annual depth of 

 the river, and a diagram representative of these. It had been alleged 

 that a greater quantity of water was being delivered by the Vistula 

 than previously, and reference is made to these tables as proof that 

 this was unwarranted, and as supplying evidence that the delivery 

 was being diminished. 



3. In regard to the Danube at Vienna, with a tabulated statement 

 of the highest and lowest water levels, observed at Vienna in each 

 year from 1826 to 1871, with the calculated mean level; a tabulated 

 statement of similar observations at Orsova, for the years from 1 840 to 

 1871 ; and a tabulated statement for comparison of the height of the 

 Danube at ten other stations on the river ; a diagram representative 

 of the observations at Vienna, in the period 1849-1871; a diagram 

 representative of the delivery or flow in the several months of the 

 year in the two periods 1826-1848, 1849-1871 ; and a diagram 

 representative of the comparative water levels at the several stations 

 on the Danube mentioned in the tabulated statement. 



There is given a similar tabulated statement of observations made 

 at the pegel on the Oder at KtLstrin, from 1778 to 1835. And in 

 regard to all of these he writes : " To facilitate the comparison the 

 fall in the level in the five rivers named, I have reduced the 

 recorded observations to their equivalents for a period of 50 years, 

 and I have thus obtained the results embodied in the following 

 table. The measurements are given in Rhenish inches : 



