.Miscellanies. 389 



7. Virus of Small Pox.-^A communication from Dr. Ozamann of 

 Lyons was read at the French Academy on the 4th of August, in which 

 the writer states; 1st that he has ascertained that the matter of small 

 pox, if mixed with fresh cow's milk, produces an eruption similar to 

 that of the Vaccine virus, and has the same faculty of propagating the 

 Vaccine disease innate in man, but that it was imported into Europe 

 about the 6th century, by the Moors of Spain; 2d that the Vaccine is 

 real Variola but of the most benign species; 3d that by inoculating 

 with the Vaccine virus alone, or with that of Variola mingled with 

 fresh cow's milk in very small quantity, We obtain generally as many 

 punctules or punctures, and that the pustules are the real small pox, 

 which guarantees children from this malady, in its state of malignity. 

 Hence there need be no want of vaccine matter, for if the small pox 

 make its appearance in any district, by taking the matter from a pus- 

 tule on the 6th day after the eruption, that is, when the liquid it con- 

 tains is fluid and clean, mixing it with milk, and inoculating with this 

 mixture, the result will be the same as with Vaccine matter.— JSeu. 

 Encyc. Aout, 1830. 



Mechanical fhilosophy. 



1. Roman Aqueducts. — In an Essay on the means of conducting, 

 raising and distributing water by M. Genieys, Engineer, &.c. 4to^ 

 pp. 315, Paris, 1839, the author states, in a historical account of the 

 principal hydraulic works of the Romans, that the total length of the 

 aqueducts employed in the distribution of Water through ancient 

 Rome was forty three myriameters or 107 post leagues. Three fourths 

 of this length were subterranean vaults ; eight leagues were in ar- 

 cades raised to the height of thirty two metres ; and the volume of 

 water furnished by the aqueducts was seven hundred and eighty five 

 thousand cubic metres in twenty four hours. 



- The fountciins of Rome are still an object of admiration, not so 

 much on account of their beautiful architecture and their sculptured 

 ornaments ; as for the torrents of water which they difiuse. The 

 Pauliric fountain dispenses daily thirty six thousand cubic metres, and 

 that of St. Peter's at the Vatican, consisting of a simple pipe raised 

 upon a pedestal, distributes six thousand, while the jet in the Palais 

 Royal, so much admired in Paris, emits but one thousand seven hun- 

 dred cubic metres in twenty four hours. 



Notwithstanding our acquaintance with this branch of physico- 

 mathematical science as evinced by the immense works of Versailles 

 executed under Louis XIV. and the most learned researches and ex- 

 periments by French Sc^avans, few of our cities (France) possess 



Vol. XIX.— No. 2. 50 



