STRUCTURES ON THE EASTERN SIDE OF THE ORION NEBULA. 



Both pictures huve bpon made from negatives kindly lent by Dr. Isaac Roberts. 



1. — Made from a long-exposed pliotograph of the Orion 

 Nebula, showing notches on the eastern edge of great 

 branching structure. 



2. — Made from a photograph taken with a shorter exposure, 

 showing the well-defined eastern edge of the same structure, 

 with small and large notches. 



