1823.] of the Egg during Incubation. 109 



grains in 1000; and the weights of its constituent principles in 

 their moist state and without boiling, are as follows : 



Grains. 



Residuum of albumen, membranes, &c. 29-5 



Animal 555-1 



Yelk 167-7 



Shell and loss 247-7 



1000-0 



" At this period all the important changes of incubation are 

 completed. The albumen has now disappeared, oris reduced to 

 a few dried membranes and an earthy residuum (apparently con- 

 sisting of the original earthy matter of the albumen which has 

 remained unappropriated). The yelk is considerably increased 

 in size,* and is taken into the abdomen of the chick ; while the 

 animal'has attained a weight nearly corresponding to the original 

 weio-htof the albumen, added to that lost by the yelk, minus the 

 total weight sustained by the egg during incubation. The alka- 

 line matters and chlorine which have been decreasing from the 

 commencement of incubation, have now undergone further dimi- 

 nution in quantity, while the earthy matters have increased in the 

 most striking manner. The other principles seem to have suffered 

 very little change in quantity." 



Residuum of albumen, 

 membranes, See. 



Animal 



Yelk 



Sulphu- 

 ric acid. 



0-04 

 0-44 

 0-04 



0-52 



Phos- 

 phoric 

 acid. 



0-12 

 3-02 

 1-06 



Chlorine. 



Potash, so- Lime, mag- 

 da, and] nesia, and 

 carb. of] carb. of 

 ditto. ditto. 



4--20 



0-09 

 0-55 

 0-03 



0-07 



0-23 

 2-26 

 0-06 



2-55 



0-12 

 2-58 

 1-26 



3-96 



Dr. Prout observes, that the analyses in his paper are selected 

 as the most perfect, from a variety of others made at each period, 

 all of which confirm the results he has given : and he then states 

 his conclusions from them, thus : 



" These experiments, then, demonstrate, or render probable, 

 the following circumstances : 



♦ " This has been denied or doubted by some writers, especially Halle/ and Dj, Ma- 

 cartney." 



