Trans. N. V. Ac. Set. 114 Apr. i6, 



He farther inquired whether the solution of tartaric acid, and that 

 of milk-sugar with silver nitrate, were not affected by light. 



Dr. Schoeney described the precautions to be observed in 

 Koch's method, and inquired whether the living germs in a water 

 became recorded by the same results — envelopment in a cloudy 

 vesicle — as the merely decomposable organic matter. 



Prof. Leeds replied that he had applied his method to a series of 

 polluted drinking waters and many organic substances. 



He had applied Koch's method, according to the plan 

 recently suggested by Dr. Angus Smith, to the Philadelphia water, 

 in tall jars, compared with others containing sewage and a hay-in- 

 fusion. But, strange to say, no action occurred even in the two 

 latter after five days, only a slight turbidity appearing upon the 

 surface of the hay-infusion. Eventually the hquefaction and tur- 

 bidity of the gelatine took place in all and the resalts fell to the 

 bottom, only microcci and bacteria, not bacilli, being detected in 

 the liquid. 



The products of decomposition of the gelatine, that which had 

 been transformed and stinking under the action of the microcci 

 and bacteria, and in which these organisms were now dead, affected 

 the silver salts powerfully ; the gelatine, which had not been trans- 

 formed, but was in its original condition, exerted little influence 

 upon the silver salts in the presence of light. 



April 1 6, 1883. 

 Lecture Evening. 

 The President, Dr. J. S. Newberry, in the Chair. 

 The large hall was filled by an interested audience, who lis- 

 tened to a lecture, illustrated with diagrams and lantern-slides, by 

 Prof Hamilton L. Smith of Hobart College, Geneva, N. Y., on 



THE GREAT PYRAMID, AND THEORIES CONCERNING IT. 



(Abstract). 



After a short sketch of the geographical position of the pyramids 



of Lower Egypt, illustrated by charts and maps, and a notice of their 



difference in structure, considered as tombs, from all the other tombs 



injthe neighborhood, and a somewhat extended study of the monu- 



