﻿36 FIELD AND FOREST. 



two others, occurred shortly before the outbreak. A brook which ran 

 past this house received the dejections of the patients and their linen 

 was washed in it. This brook was employed for the irrigation of some 

 meadows near the farm house, and the effluent water filtered through 

 the intervening mountain to a spring used in all the houses of Lausen, 

 except six which were supplied with water from private wells. In these 

 six houses no case of fever occurred, but scarcely one of the others 

 escaped. No less than 130 people, or seventeen per cent, of the whole 

 population, were attacked, besides fourteen children, who received the 

 infection whilst at home for their holidays, and afterwards sickened on 

 their return to school. 



The passage of water from the irrigated meadows to the spring at 

 Lausen was proved by dissolving in it, at the meadows, 18 cwt. of 

 common salt, and then observing the rapid increase of chlorine .in the 

 spring water; but the most important and interesting experiment con- 

 sisted in mixing uniformly with the water 50 cwt. of flour, not a trace 

 of which made its way to the spring, thus showing that the water was 

 filtered through the intervening earth and did not pass by an under- 

 ground channel. 



These are the main features of the case, but there are other interest- 

 ing details showing how carefully the investigation was conducted ; 

 for these, however, I must refer Mr. Mitchell Wilson to the works 

 above cited. It affords a clear warning of the risk which attends the 

 use, for dietetic purposes, of water to which even so called purified 

 sewage gains access; notwithstanding that, as at Lausen, such water 

 may have been used with impunity for years, until the moment when 

 the sewage became infected with typhoid poison. 



Entomological Club of the A. A. A. S. 



We desire to call the attention of entomologists of the United States 

 and Canada, to the fact that the Entomological Club of the American 

 Association for the Advancement of Science will meet at Buffalo, 

 N. Y., on the 22nd of August, in some place that will be provided by 

 the local committee of the Association. 



All interested in the subject of entomology are invited to attend, 

 and to repair at first to Tifft House for instructions. 



C. V. Riley, Secretary, John L. LeConte, President. 



