34 



MASS. EXPERIMENT STATION BULLETIN W, 



'X 







Figure 9. Propagation House showing Sand Benches, with cloth curtain on the sides below 

 to confine the heat underneath; cloth screens above to shade the rooting cuttings; ventilators 

 for air exchange; thermometers for registering sand and air temperatures; and a particular 

 regard for neatness and sanitation. 



