■iS BULLETIN OF THE NATURAL HISTORY SOCIETY. 



of rock, gravel and sand, with no mud. Its animal 

 and plant life show some features of interest, worthy of 

 more extended notice. It is noted for the immense trout 

 it contains, a fact which I give from heresay, since my 

 own numerous experiments upon this point yielded only 

 negative results. It is locally reputed bottomless, but in 

 the summer of 1895 Mr. S. W. Kain and I sounded it 

 thoroughl}' and found its maximum depth to be seventy- 

 eight feet; but this is a great depth for so small a lake. 

 Its beaches, as a rule, slope down very suddenly, so that 

 its average depth must be considerable. 



Fig. 1. Sketch map of Clear Lake. C = log camp. Scale about 

 six inches to one mile. 



Last summer I was enabled b}- the courtesy of Pro- 

 fessor John T. Stoddard, of Smith (college, Northampton, 

 Mass., to bring to Xew Brunswick the Thermophone 

 belonging to the department of phj'sics in the college. 

 By this instrument, recently invented, temperatures can 

 be read at any distance and in any position to which a 

 metal coil can be sent. Its principle cannot be explained^ 



* It depends upon the fact t'lat the electrical resistance of metals varies with 

 temperatu: e. Two pieces of (different) metals forming the " temperature coil " are 

 connect d up as a " Wheatsione Bridge " and so coni.ected witi' a special batterj- 

 and telephone that the latter hums wjjile lesistances are luiequal and a current is 

 passing through it. but becomes siieni as a slidmg contact equalizes tht» resistances, 

 and a pointer then indicates upon a fcale the temperaiure in the distant coil. The 

 inst^um^■^t is very accurate, and temperatures can be read it is said to .1", though 

 in a moving bont in a breeze about .25° is as c.tseas one can read easily. It is 

 made only by E. 8. Ritchie & Sons, of Brookline, Mass. 



