ZOOLOGY. 321 



through experimental breeding of the varieties which he has had 

 under observation for the past 13 years and crosses of these varieties 

 with the varieties and species obtained from Peru and to be obtained 

 from other parts of South America. For this latter purpose he has 

 in mind an earl}^ expedition to regions of Brazil, Argentina, and 

 Bolivia, where several distinct species of cavy are reported to occur, 

 but which it seems quite impossible to obtain except by personal 

 efforts. (2) A second objective point is further study of selection 

 in relation to mutation and the possible control of mutation through 

 selection. For this rats seem to be especially favorable material and 

 it is proposed to utilize the stocks already in hand. (3) A third 

 object for intensive study is the interrelations and modifiability of 

 certain color patterns in rabbits, some of which are dominant, others 

 recessive in crosses. One phase of these questions the writer has been 

 studying for the past three years in collaboration with Dr. P. B. 

 Hadley, of the Rhode Island Agricultural Experiment Station. Two 

 or three more years of work will be required to attain our objective 

 point. 



Naples Zoological Station, Naples, Italy. Grant No. 842, allotted 

 December 13, 1912. Maintenance of two tables for American biolo- 

 (For previous reports see Year Books Nos. 2-11.) $1,000 



The two Carnegie Institution study tables were, during the last 

 term, occupied by Professor Howard S. Reed, plant pathologist of 

 the Virginia Agricultural Experiment Station, and Professor Ulric 

 Dahlgren, of Princeton University. 



Professor Reed worked on the permeability of the living cell. 

 After some preparatory work on Bornetia and Griffithia, he concen- 

 trated his researches upon Valonia, and studied the amount of anamo- 

 nium salts which enter the living cell under normal conditions and 

 also in the presence of different substances (vanilline, cumarine, 

 heliotropine, etc.). 



Professor Dahlgren was occupied with cytological researches on 

 the cells of the electric organ of torpedo, of which he found abundance 

 of material during his whole staj^ at the zoological station. He was 

 also interested in the phenomena of luminescence in various marine 

 animals. 



Riddle, Oscar, University of Chicago, Chicago, Illinois. Grant No. 845, 

 allotted December 13, 1912. Preparation for publication of the manu- 

 scripts of the late Dr. C. 0. Whitmati, provision for care and mainte- 

 nance of the Whitman pigeon collection, and continuation of investigations 

 necessary for completion of Dr. Whitman's manuscripts. (For previous 

 report see Year Book No. 11.) $4,400 



Considerable preliminary work has been done with Professor 

 Whitman's records and manuscripts bearing on orthogenesis, the chief 

 subject of his unpublished studies. Much work will be required 



