ON THE TEMPERATURE OF THE FRESH-WATER LOCHS OF SCOTLAND. 423 



It was thought that these curves were not definitely conclusive of the periodic 

 nature of these changes. The curves were certainly confused at some points. This 

 could hardly be otherwise, considering the complexity of the forces at work — wind, 



T'hcrmom&terat/oofeeb. 



Fig. 9.* 

 currents, etc. ; and to those accustomed to work with seiche records obtained from 

 limnographs they cannot appear more confused than the records which are often 

 thereby obtained. For with ordinary seiches there is always interference between 

 seiches of different nodality, and there is no reason to doubt that there should be like 

 interference in the case of temperature seiches. It was hoped definitely to settle 



* The actual scale of the platinum thermometers was, for practical reasons, not accurately determined. The 

 sudden change between 4 p.m. and 5 p.m. means an increase in temperature of about 9° F. 



TRANS. ROY. SOC. EDIN, VOL. XLV. PART II. (NO. 16). 60 



