NOTES 123 



dust be wiped off from the surface instead of pushed 

 through with the broom, will store much dust under- 

 neath. 



Miss R. of Illinois has learned that one element in 

 'Vital resistance" is to keep one's self in good health, 

 "for then my tonsilitis germs wouldn't have de- 

 veloped." This is her decision after having spent a 

 part of the "Glorious Fourth" in bed in the study of 

 Part II. 



One of our students in Michigan has experimented 

 in the sterilization and canning of milk, "using a solu- 

 tion of salt to increase the temperature of the water." 

 She found that by repeating this process three succes- 

 sive days the milk would and did "keep over three 

 years and would have kept indefinitely except for an 

 accident." 



An enthusiastic teacher from Canada who "enjoys 

 bacteriology heartily," performed not only the expe- 

 riments with dust gardens but also numerous others, 

 with most satisfactory results. Her enthusiasm and 

 success may well be passed along for the benefit of 

 others. 



One of her best results in growing molds came from 

 a medium of ten per cent prune juice, ten per cent 

 gelatine with eighty per cent water. This was ex- 

 posed for twenty minutes. In a week there had 

 grown "about twenty mold colonies" and five of 

 bacteria. 



Another garden was made like the above, substitut- 



