LECTURE VII. 



INSTINCT CONNECTED WITH THE PARENTAL RELA- 

 TION.— AS DEMANDING CERTAIN CHANGES IN 

 OTHER ANIMALS AND PLANTS.— AS A LAW FOR 

 THE ANIMAL.— AS SUBJECT TO VARIATION. 



Effect of Parental Instinct.— Completes its course.— Disturbed by 

 Domesticatio7t.— Answering Instinct of the young.— Correlation 

 of the three kingdoms of Nature.— Hibernation.— Gall-flies.— Ich- 

 neumon-flies. — Bot-fly. — Tent-moth. — Oak-pruners. — Borer.— 

 Preservation of the fittest.— Instinct as a Law.— Uniformity 

 among Animals.— Periodicity and Self -regulating power of the 

 Appetites.— Instinct can be deceived.— Follows the impression of the 

 senses.— Variation of Instinct.— Production of varieties.— Defini- 

 tion of an Instinct, and of Instinct as a general term. 



We have already referred, incidentally, to some of 

 the manifestations of Instinct connected with the 

 parental relation. But there is in this relation, so 

 much of antagonism to common instincts, as to 

 make it worthy of separate consideration. 



In many cases, the character of the animal, 

 while it has young, seems to be entirely changed. 

 Often the most timid animals become brave in de- 

 fence of their offspring, and the welfare of the indi- 

 vidual is sacrificed for the good of the species. We 

 may announce it as the general law of all the in- 

 stincts connected with the reproduction of young, 

 that they are exercised at the expense of the indi- 



