THE PITUITARY BODY 



pig (2); goat (4, 8, 9, 11); cow (4, 10); monkey (5, 13)/^ Not 

 much is to be gained from a detailed discussion of the various 

 experiments. The conditions under which an anterior pitui- 

 tary extract will cause lactation in the mouse, rat, and monkey 

 particularly require further study (see Turner and Schultze, 

 1 93 1; and Gardner and Turner, 1933). The milk secreted in 

 response to the lactogenic hormone contains more ash which, 

 however, is less alkaline (goat, 9), or more ash and less fat 

 and solids (cow, 4), or normal fat, more chloride, less lactose 

 with a normal pH and coagulation-time (cow, 10). 



THE ASSAY OF THE LACTOGENIC HORMONE OF 

 THE PARS GLANDULARIS 



The assay of the lactogenic hormone by determining its 

 effect on the crop glands of the pigeon was discussed earlier 

 in this chapter. Provided that the development of the crop 

 glands is stimulated by the same hormone causing lactation 

 in mammals — and this so far seems to be true — this method 

 of assay appears to be best. For discussions of the best meth- 

 od of assaying the lactogenic hormone in mammals (a matter 

 of controversy), the reader is referred to the papers of 

 Gardner and Turner (1933), Lyons and Catchpole (1933), 

 and Nelson (1934). 



THE PREPARATION AND PROPERTIES OF LACTOGENIC 

 EXTRACTS OF THE PARS GLANDULARIS 



In the paper of Riddle, Bates, and Dykshorn (1933) will 

 be found the evidence from which they concluded that the 

 lactogenic hormone is different from the gonad-stimulating 



'* The numbers in parentheses refer to the following authors: (i) Strieker and 

 Grueter (1928-29); (2) Griiter and Strieker (1929); (3) Corner (1930); (4) Griiter 

 (1931); (5) Hisaw and others (1931); (6) Nelson and Pfiffner (1931); (7J Turner and 

 Gardner (1931); (8) Asdell (1932); (9) von Fellenberg and Griiter (1932); (10) 

 Catchpole and others (1933); (11) Evans (1933); (12) Gaebler (1933); (13) Hart- 

 man, quoted by Riddle and others (1933); (14) Gardner and Turner (1933); (15) 

 Lyons and Catchpole (1933); (16) Lyons and others (1933); (17) Nelson and 

 Smelser (1933); and (18) Nelson (1935). 



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