Vle CONG. INTERN. REPROD. ANIM. INSEM. ARTIF., PARIS, 1968, VOL. |l f a good research tool to study the freezing and thawing problems of semen that are very sensi- tive and those that have thwarted attempts at low temperature preservation. REFERENCES I. Meryman, H. T., and E. Kafig. Proc. Soc. Exp. Biol. Med. 90:587. (1955). 2. Graham, E. F. A.l. Digest 9:8. (1961). 3. Rajamannan,A.H.J., Graham, E. F., and F. Smith. Vth International Congress on Animal Reprod. 4:392. (1964). 4. Nagase, H. and Graham, E. F. Vth International Congress on Animal Reprod. 4:387. (1964). 1143