HENSHAW: REPORT OF SECRETARY AND LIBRARIAN. 21 
Rhodora, Boston; Washington academy of science, Washington; 
Yorkshire naturalists’ union, Leeds. 
The Society now exchanges its publications with 432 scientific 
institutions and periodicals. 
One thousand and thirty-seven books have been borrowed by 115 
persons; 480 volumes have been borrowed for use in the building, 
and the library has been consulted 450 times. 
Three hundred and sixty-eight volumes have been bound in 324 
covers; 362 pamphlets have been bound. 
Twenty-five volumes of the Verhandlungen zoologisch-botanische 
gesellschaft, Wien, have been indexed; current volumes of serials 
previously indexed are indexed as received. 
Taking advantage of the aid afforded by a generous though 
anonymous patron, we have bound all the. unbound books and 
pamphlets on several alcoves in the back library; the alcoves 
selected being those nearest the windows and thus the most exposed 
to light and dust. 
Walker Prizes. 
The subjects selected by the Walker Prize Committee for 1899 
were: — 
1. Is there fundamental difference between 4 equation division’ 
and ‘reduction division ’ in the division of cells? 
2. The phenomena and laws of hybridization. 
The only essay received, one on the relations between the hybrid 
and parent forms of echinoid larvae, having been published in 
Philosophical transactions of the royal society of London, could not 
be considered by the Committee, as in all cases the memoirs are to 
be based upon original and unpublished work. 
It is greatly to be regretted that the annual awards of Walker 
prizes are so frequently omitted, and it is suggested that the selec¬ 
tion of subjects of broader scope would secure more general 
competition. 
The subjects for the award in May, 1900, are: — 
1. Stratigraphy and correlation of the sedimentary formations of 
any part of New England. 
2. A study in palaeozoic stratigraphy and correlation. 
