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RAYMOND PEARL 



amount of exact autopsy material from treated individuals has 

 as yet come into hand. Later it will be possible to deal more 

 exhaustively with organ weight data. 



It will be recalled that, as stated in I, the present report in- 

 cludes only the data obtained from the beginning of the experi- 

 ment in September, 1914, up to February 1, 1916. 



II. MORTALITY 



Inasmuch as many of the birds with which the experiment 

 started are still alive it is obviously impossible at the present 

 time to go into the question of the effect of the alcohol treatment 

 upon the duration of Hfe. What can be done, however, is to 

 examine the facts as to the mortality of the treated and control 

 birds during the fii'st 15 months of the experiment. The data 

 for such an examination have already been given in table 2 of 

 I for the females only, and are summarized in convenient 

 form in table 1 of the present paper. 



In explanation of the headings of table 1 it should be said that 

 considerations of space on the poultry plant made it necessary 

 to dispose of a part of the control birds (untreated) in the fall 

 of 1915. The individuals so disposed of by sale were nearly a ran- 

 dom sample from every point of view of the respective ma tings 

 from which they came. They were certainly a random sample so 

 far as concerns general bodily vigor and probable duration of 

 life. From the standpoint of mortality figures the only thing 

 which can be said of them, however, is that they are certainly 

 known not to have died within the first 500 days of their lives. 

 It should be further noted in regard to table 1 that in the case 



TABLE I 

 Showing data regarding 7nortality to February 1, 1916. Females only 



