%#606 THE AMERICAN NATURALIST [Vol. LI 



per cent, of all their young, and their young grew the 

 fastest of all the lines. 



It is a matter of regret that owing to an accident— 

 over-alcoholization one day— the second and third gen- 

 erations were not carried farther. However, as far as 

 they went, no injurious effect from alcohol is apparent in 

 fertility, nor vigor of growth, and but a small one in 

 viability. 



From indications in our results it would seem to be 

 dangerous to draw far-reaching conclusions from data 

 obtained on a eingle species. Although this work was 

 not carried as long as it was planned, yet as it corrob- 

 orates my former experiments in practically every detail 

 it goes to prove that mice are to a degree resistant to 

 alcohol whether it is fed or inhaled by them. From re- 

 sults obtained in bacteriological laboratories it is well 

 known that mice are very resistant little animals, in com- 

 parison to sensitive animals like guinea pigs. Mice are 

 immune to the toxin of the tetanus bacillus. It seems 

 reasonable to expect that an animal which is immune to 

 such a virulent toxin might have a considerable degree of 

 resistance to the effects of alcohol. 



Summary 



1. The white mice given alcohol by the inhalation 

 method gave much the same results as those that received 

 it in their food in my former experiments. 



2. The fecundity of the alcohol mice was greater than 

 that of the control mice, as in my former study. 



3. Six per cent, of the young of the male alcohol line, 

 6.8 per cent, of the double alcohol line, 9.8 per cent, of the 

 female alcohol line and 4 per cent, of the second gen- 

 eration alcohol line died from lowered vitality, while none 

 of the control young died. Similar results were obtained 

 in my former experiments, except that the alcohol line 

 had a higher death rate— 11.1 per cent, in the first gen- 

 eration and 12.5 per cent, in the second generation. 



4. The growth of the young of all the alcohol lines ex- 



