1821.] Flicenomena of Heat, Gases, Gravitation, S)C. 351 



proportion, between certain temperatures, that scarcely any 

 difference can be observed. AVith this fact, therefore, it will be 

 no difficult matter to examine the preceding theorem by direct 

 experiment, in a more general way than we have yet supposed ;. 

 for all the other ratios might be easily determined by methods 

 already known, and the temperatures might be measured between 

 the limits alluded to by a common mercurial thermometer, either 

 in the way that is pointed out in cor. 5, prop. 8, or by dividing 

 the thermometer into equal parts, letting the freezing point stand 

 at 80^ and the boihng at 110° ; in which case the divisions v^^ould 

 indicate the squares of the temperatures. Thus all the ratios^ 

 might be obtained by experiment independently of each other y 

 consequently, by combining any of them according to the 

 theory, we shall be able to see whether the result agrees with 

 that given by experiment. 



Having now demonstrated, as they flow from our principles^ 

 some of the chief properties of gaseous bodies, after the manner of 

 mathematicians, and in a w^ay that I hope will satisfy the Royal 

 Society, both of the legitimacy and simphcity of those principles,, 

 I shall throw some other things, which it appears necessary 

 to add, into a general scholium. 



{To be continued.) 



Article IV. 



A Memoir on the Physiologi/ of the Egg, read before the Linnean 

 Societij of London, on March 21, 1809 ; an Abstract of which 

 is published in the Society's Transactions. By John Ayrton 

 Paris, MD. &c. &c. 



[Having accidentally seen Dr. Paris's paper on the Physio- 

 logy of the Egg, which had been printed, about 10 years- 

 since, for private circulation, it appeared to me to contain so 

 much curious matter that I was desirous of inserting it in the- 

 Annals. Dr. Paris has not only kindly consented to my request^ 

 but has added several new and interesting particulars to his ori- 

 ginal memoir. — Edit.] 



*' At certe Natura, si fieri potuisset, maxime optasset suum opificium esse immortale ; 

 quod cum per materiaiTi non liceret, subsidium quod potuit ipsi ad immortalita- 

 tem est fabricata, nam mirabilem quandam rationem invenit, quomodo in demor- 

 tui animalis locum, novum aliud sufficiat." — Galen de UsuPartium. 



The extensive range which the Ovipari form in the scale of 

 animated existence renders the organization and developement 

 of the egg a subject of great and general interest to the natural- 

 ist ; while the hope of ascending to the source of vitahty, by 



