Spiral Nebula Messier 51 Canum J'cnaticorum. 



Photographed with 60-Inch Reflector, on Seed "23" plate, February 7 and 8, 1910. 

 Exposure 3 h 55>n. Enlargement from negative 6.4 diameters. Scale: 1 111111 = 4". 2. 



