1912] The Ottawa Naturalist. 175 



the ground. The wild pigeon always nests in trees, generally 10 

 feet or more from the ground. 



Priority of claim will be decided by time of receipt at post 

 or telegraph office. Rewards will be equally divided, if two or 

 more letters or messages bear record of same date and hour. 

 All nestings within one mile of one another will be counted as 

 one colony. 



Please report all pigeons seen, giving exactly date, hour, 

 number in flock, direction of flight. Unless absolutely certain 

 that you know the Band-tailed, Viosca and Red-billed pigeons, 

 do not report that you have seen the passenger pigeon in the 

 Rocky Mts. or Pacific Coast region, from British Columbia to 

 Mexico. 



As soon as a pigeon nesting is surely identified write the 

 undersigned, who will arrange for confirming party and for 

 payment of the reward. All rewards not claimed by Oct. 31, 

 1912, will be withdrawn. 



Signed, C. F. HODGE, 



Clark University, Worcester, Mass. 



DRINKING WATER AND HEALTH. 



By Frank T. Shutt, M.A., F.R.S.C, Dominion Chemist. 



(Continued from page 171). 



Waters as used by towns or for isolated households, as 

 on the farm, may be classified as follows: Rain water; Up- 

 land surface waters; Ground waters or those of shallow wells; 

 and Deep-seated waters, as obtained by drilling or boring and 

 among which many springs may be placed. 



Rain water. This can be caught and used as such. As a 

 drinking supply little need be said of this source. In Canada, 

 where in most districts, other and larger sources of supply are 

 readily available, rain water is seldom used save for washing 

 and laundering purposes, for which by reason of its extreme 

 softness it is eminently suitable, Its quality or purity will 

 depend on the condition of the atmosphere through which it 

 falls; if in town we may expect it to contain soot and gases 

 from which it would be comparatively free if falling in rural 

 parts. Again, dirty roofs and eave troughs, storage tanks in 

 which organic debris accumulate, all contribute towards making 

 this supply foul and unfit for consumption so that even a 

 fairly pure rain water that has been stored is difficult to find. 

 However, if fresh and clean, it is not at all unwholesome, though 



