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Nachdruck verboten. 
Experimental Studies on the Development of the Eye and the 
Nasal Cavities in Frog Embryos. 
(Preliminary Communication.) 
By E. T. Bert, M.D., Instructor in Anatomy, University of Missouri. 
With 2 Figures. 
During the past year I have made a number of experiments on 
embryos of Rana esculenta with the purpose of studying the develop- 
mental physiology of the eyes and the nasal cavities. The operations 
were nearly all made under a binocular microscope with a very finely 
sharpened lancette and a pair of scissors whose points were kept as 
thin and pointed as possible. The binocular microscope is indispen- 
sable for this work. By practice one may make such operations as the 
transplantation of the optic vesicle or of the nasal plate with com- 
paratively little difficulty. 
I give below a resume of the results thus far obtained reserving 
details and figures until the work is completed. 
Regeneration of the Brain and of the Eye. 
After removal of exactly one lateral half of the anterior part of 
the brain with the optic vesicle of embryos from 2,5 mm to 3,5 mm 
