APPENDIX. 143 



24 hours; or finely divided gland digested with saturated 

 solution of NaCl; or digestion of the finely comminuted 

 gland at 40 C. in 0.7 per cent NaCl. 



Lipolytically active: slightly alkaline watery infusion of 

 the gland; or an alkaline glycerol extract of the fresh gland 

 (9 parts glycerol and 1 part 1 per cent Na^COg solution). 



Rennetically active: finely minced fresh gland digested 

 with 4 times its weight of 25 per cent alcohol for 4 to 5 days. 

 Then filter after the addition of a trace of acetic acid. 



