20 MASS. EXPERIMENT STATION BULLETIN 361 



M\Uh. 



fiiiit 



Figure 6. A, B. Greenhouse range showing obstruction to air circulation about the ends of 

 individual houses bv a connecting lean-to house. C, D. Low lean-to hou«;s showing a lack 

 of regard for light and ventilating area which makes proper air control very difficult. 



