SUPPLEMENTAL PROGRAM ARRANGED FOR 
CLASS STUDY ON 
HOUSEHOLD BACTERIOLOGY 
By S. Maria Elliott, Simmons College, Boston 
MEETING I 
(Study pages i - 14) 
Dust and Dust Gardens 
The growth of a dust garden will impress this whole sub¬ 
ject much more vividly than any amount of reading. Each 
member should plant and watch the growth of at least one 
garden. One person might prepare and sterilize the nutrient 
gelatine for the class, distributing in sterilized wide-mouth 
vials or test tubes about two teaspoonfuls to each. Each 
member should sterilize the dish or dishes, melt the gelatine 
by placing the tube in cold water and then heating it, pour 
into the Petri dish, cover, cool, and plant. 
(If not to be had locally, a dozen Petri dishes may be 
obtained through the School for $1.90, a half a dozen for 
$ r. 00, not including express charges. Money will be refunded 
for those returned.) 
Arrange as varied conditions for experiment as possible. 
The following list is only suggestive of interesting sources 
and methods of treatment: 
(a) After sweeping a carpeted room with a dry broom, 
expose five minutes, keep at room temperature, but 
not in direct sunlight. 
(b) Same as above but kept in a refrigerator. 
(c) Same as “a” but shut up in a box. 
(d) Dig out from some corner of stairway or room the dirt 
which was overlooked in cleaning. Pulverize this 
and scatter a little over the jelly. Keep in any 
condition desired. 
(e) Let a fly walk over the media. 
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