COLORADO WILD FLOWERS 



23 



Fig. 24. — A Sub-alpine Forest, 

 This illustration shows the large size of some of the Engelmann spruces. A snow 

 bank in the foreground is nearly covered up with pine and spruce needles. The small 

 building is a shelter for thermometer and other instruments used by the author in some 

 investigations made in the summer of 1908. 



