
were sectioned and studied microscopically by Dr. Blandau, who drew the 
following conclusions (letter of 29 November 1951): 
"There is remarkable uniformity in the level of spermatogenesis 
and spermiogenesis from one testis to the next. All the organs show active 
production of sperm. .. Since nothing is known concerning the rate of 
progression of sperm through the epididymis in this animal failure to 
find sperm in all tubules is probably of no significance. All epididymides 
showed some sperm in them. Estimations of adequacy of numbers could be 
only grossly estimated. . . the only conclusion that can be reached is 
that the animals in this age group do produce sperm and that the sperm are 
delivered into the epididymis and ductus deferens. These slides show no 
conclusive evidence that the males cannot reproduce, The condition of 
the tubules in the 10+t-year~olds compares favorably’ with the 5-year-old 
specimens I examined earlier." 
2. Among six sets of idle-bull testes examined earlier by 
Dr. Blandau, only one, an obviously emaciated animal, contained no active 
Sperm. 
-50- 
