In a legal sense, adoption is an act by which a  person, with the cooperation of the public  authority, selects for his child one who does not belong to him. In Roman law  adrogatio  was the  name given to the adoption of one already of full age (  sui  juris  );   datio in adoptionem  , when one was given in  adoption by one having control or power over him. The adoption was  full (  plena  ) if the adopting father was a relative in an  ascending scale of the one adopted; less full (  minus plena  )  if there was no such natural tie. Perfect adoption placed the  adopted under the control of the adopter, whose name was taken, and  the adopted was made  necessary  heir. The adoption was less perfect which constituted the adopted necessary  heir, in case the adopter  should die without a will. The rule was that a man, not a  woman, could adopt; that the adopter should  be at least 18 years older than the adopted; that the adopter  should be of full age, and older than 25 years. In Athens  the power of  adoption was allowed to all citizens of sound  mind.  Adoption  was very frequent among the Greeks  and Romans, and the  custom  was very strictly regulated in their laws.
	
 The  Church  made its  own the  Roman law  of adoption, with  its legal consequences.  Pope Nicholas  I (858-867) spoke of this  law  as venerable, when inculcating its observance upon the  Bulgarians. Hence adoption, under the title  cognatio legalis  , or "legal  relationship  ", was recognized by the Church  as a diriment impediment  of marriage.  This legal  relationship  sprang from its resemblance to the natural  relationship  (and made a bar to  marriage):
-  civil paternity between the adopter and the adopted, and the  latter's legitimate natural children, even after the dissolution of  the adoption; 
-  civil brotherhood between the adopted and the legitimate  natural children of the adopter, until the adoption was dissolved,  or the natural children were placed under their own control (  sui  juris  ); 
-  affinity arising from the tie of adoption between the adopted  and the adopter's wife, and between the adopter and the adopted's  wife. This was not removed by the dissolution of the adoption. 
 The  Church  recognized in the  intimacy consequent upon these legal relations ample grounds for  placing a bar on the  
hope  of marriage, out of respect for public  propriety, and to safeguard the  morals  of those brought into such close  relations. The Code of  Justinian  modified the older  Roman 
law  by determining that the  rights  derived from the natural parentage  were not lost by 
adoption by a stranger. This gave rise to another  distinction between perfect and imperfect adoption. But as the  modification of  Justinian  made no change in the customary  intimacy brought about by the adoption, so the  Church  at no  
time  expressly recognized any distinction  between the perfect and less perfect 
adoption as a bar to marriage.  There arose, however, among canonists a controversy on this  subject, some contending that only the perfect 
adoption was a  diriment  impediment  to  marriage.  Benedict XIV  (De Syn.  Dioec., I, x, 5) tells of this discussion and, while giving no  positive decision, lays down the principle that all controversies  must be decided in this 
matter in accord with the substantial sanctions  of the Roman law. This is a key to the  practical question which today arises from the more or less serious  modifications which the Roman, or Civil,  
law  has undergone in almost all the  countries where it held sway, and hence flows the consequent doubt, at times, whether this  diriment  impediment  of  legal  
relationship  still  exists in the eyes of the  Church.  Wherever the  substantial  elements of the  Roman 
law  are  retained in the new codes, the  Church  recognizes this  
relationship  as a diriment impediment  in accord  with the principle laid down by  Benedict XIV. This is thoroughly recognized  by the Congregation of the Holy Office in its positive decision  with regard to the Code of the  Neapolitan Kingdom  (23 February, 1853). In  Great Britain and the  United States  legal adoption, in the sense of the  Roman law, is not recognised. 
Adoption  is regulated in  the  United States  by State  statutes  ; generally it is accomplished by  mutual  obligations  assumed in the  manner prescribed by  law. It is  usually brought before the county clerk, as in  Texas, or before the probate judges, as in New Jersey. In such cases the  relation of  parent  and  child is established; but the main purpose is to entitle the  adopted to the  rights  and privileges  of a legal  heir.  Adoption, or 
contract  by private  authority, or under private arrangements, is not recognized by the Church  as productive of this legal relationship. The  Congregation of the Holy Office (16 April, 1761) had occasion to  make this declaration with regard to it, as customary among the Bulgarians. Hence, generally in the United States  
adoption is not a  diriment  impediment  to  marriage, nor in the eyes of the  Church  in any way preventive of it. A  different view is taken by the  Roman  Congregations of the Holy Office and of the Sacred Penitentiary  of 
adoption as recognised in other countries which have retained  the  substantial  elements  of the  Roman 
law  establishing this relationship. The French  Code (art. 383) decides that the adopted 
will remain with his  natural  
family  and preserve all his rights, but it enforces the  prohibitions of marriage as in the  Roman law. Hence the Congregation of the  Penitentiary decided (17 May, 1826) that if the 
adoption took place  in accordance with the French  law, it involved the canonical diriment impediment  of marriage.  In  Germany, by the new 
law  taking effect in  1900, there is prescribed the procedure by which 
adoption is  effected, and by which the adopted passes into the  
family  of the adopter, losing the  rights  coming from his natural  family. In  Germany, however, many subtile distinctions  have been engrafted upon this adoption. The restrictions of the 
relationship  by the  German  
law  are not,  however, accepted by the  Church.  When 
adoption is in accord with the  substantial  elements of the  Roman law, as in the case of the German  code, in the eyes of the  Church  it  carries with it all the restrictions in the   
matter of  marriage accepted by the  Church  from the  Roman law. Thus, by the  German  law, the wife of  the adopter is not united by  affinity  to the adopted, nor the adopter to  the adopted's wife. But the  Church  still recognises this  affinity  to hold even in  Germany. The  Austrian  Code has almost the same prescriptions  as the  German. When there is a reasonable  
doubt  or difference of opinion among  canonists or  theologians  upon the  fact of legal  relationship, the safe rule is to ask for a dispensation. In the Legislature of  Quebec, a few years ago, an attempt was made to introduce into the  Civil Code the almost identical principles of the Napoleonic Code  for adoption, but the proposal was rejected by the Chamber. The Church  authorities in  
Canada  do not recognise that any impediment  to marriage  arises from whatever private arrangements of 
adoption may be there  recognized.
  
			 
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