HORMONES 



TABLE I 



A List of Animal Hormones, Their Chemical Nature, and Some of Their 



Biological Activities 



Name 



Tissue of 

 origin 



Chemical 

 nature 



Growth and de- Corpus cardia- Unknown 



velopment (GD) cum, ring 

 hormone gland, 



prothoracic 

 gland 

 JuvenUe hormone Corpus allatum, Unknown 



ring gland 

 Stimulant of GD Brain Unknown 



secretion 



Insect gonad stim- Corpus allatum Unknown 

 ulant 



Voltinism hor- 

 mone 



Stimulants of 

 chromatophores 



Subesophageal 

 ganglion 



X-organ, sinus 

 gland, central 

 nervous system 



Unknown 



Intermedin-like 

 polypeptides 



Retinal pigment- Central nervous Unknown 

 stimulating hor- system 



mone 



Molting inhibitor X-organ and 



sinus gland 



Crustacean gonad X-organ and 



stimulant sinus gland 



Secretin 



Pancreozymin 



Cholecystokinin 



Enterogastrone 



Intestinal mu- 

 cosa 



Intestinal mu- 

 cosa 



Intestinal mu- 

 cosa 



Intestinal mu- 

 cosa 



Unknown 

 Unknown 



Polypeptide 



Unknown 

 Unknown 

 Unknown 



Principal 



known 

 biological 

 activities 



Facilitates metamor- 

 phosis in insects 



Inhibits adult differ- 

 entiation in insects 



Induces GD hor- 

 mone secretion in 

 insects 



Stimulates female 

 gonad activity 



Causes diapausing 



eggs 



Induce lightening or 

 darkening of pig- 

 mented end or- 

 gans in Crustacea 



Stimulates contrac- 

 tion and disper- 

 sion of retinal pig- 

 ment granules in 

 Crustacea 



Prevents molting in 

 crustaceans 



Stimulates gonad ac- 

 tivity in crusta- 

 ceans 



Stimulates secretion 

 of pancreatic juice 

 and bile 



Enhances secretin ef- 

 fect 



Stimulates gall blad- 

 der contraction 



Inhibits gastric mo- 

 tility 



Continued 



177 



