488 



MTSS O. C. LODGE ON THE 



As a further test of the attractiveness of liver, another piece 

 (three days old) was placed in the slaiighter-honse yard near a 

 large trap baited with a horse's head. It was certainly attractive, 

 catching about 400 flies * in 24 hours, showing that liver still 

 attracted even amongst all the counter attractions of the slaughter- 

 house yard. 



The following lists (F-I) give the summary of the results from 

 the experiments with the different meaty substances. 



F. Substances found to he most and continuously attractive 

 to Blow-flies (Lucilia and Calliphora) t. 



Liver + maggots. 



Meat + „ 



Brain + „ 



Fish + „ 



Hard-boiled eggs + maggots. 



G. Suhstances slightly attractive on first day, and also 

 subsequently. 



Pish (under wire-ganze trap). 

 Boiled meat. 



,, ,, + maggots. 



Marrow in bone. 



„ „ + maggots. 



Dead birds (mostlj' sparrows). 



H. Substances not attractive till second day, and, then 

 moderately so. 



Meat + pepsin + HC1. 

 Fish + „ + „ 

 Meat + Methyl Indol. 



I. Substances unattractive to Bloio-fiies. 

 Blood. 



Bacterjzed blood, i.e. blood prepared with putrefying bacteria. 

 Fresh hard-boiled egg. 

 Fat. 



Freshwater mussel (Anodon). 

 Hard-boiled egg -t- Methyl Indol. 

 Fresh meat + Skatol. 



Unblown meat (covered by wire-gauze trap). 

 Alcoholic extract of putrid meat + bread. 



„ „ „ „ + bread + maggots. 



„ „ „ egg + bread. 



„ „ „ ,, + ,, + maggots. 



* The actual count was 138 Zucilia, +49 CaJliplinra, +51 Fannia, + 97 Green- 

 landica, +57 ilies too damaged to recognize, +4 which escaped. Total 396. 



t In these and all subsequent experiments the blow-flies used were Lwcilia and 

 Callipliora. P. groenlandica were only used in the first experiments, when it 

 was still early in the season for the other species. 



