THE NEW YORK  TENEMENT-HOUSE EVIL AND ITS CURE    373

1. Houses with windows only at the front and rear, all the cen¬
tral rooms being dark. A regulation of the Board of Health also
prevents the erection of more of this kind. Those now in exist¬
ence, like the rear tenements, should be destroyed.
 

Rear Lot Line
 

Figure 1,
 

2.  Houses having enclosed courts or wells at the sides.

3.  Houses having spaces at the sides which are open at the
 

rear.
 

4. Houses having the characteristics of both of the two former
varieties.