90 



door conditions. Formerly, it was the plan to re- 

 move and renew practically all the soil each year, 

 but at the present time the soils remain indefinitely, 

 being thoroughly disinfected at least once during 

 the season and sometimes oftener. 



Watering must be provided for. In the small 

 houses satisfactory work may be done with the com- 

 mon hose, but in the larger houses this method 

 becomes practically impossible and a system of over- 

 head pipes is almost universal. 



