Changes

|year= 1859

|year= 1859

|publisher= The project Gutemberg (contemporary)

|publisher= The project Gutemberg (contemporary)

|url=http://www.gutenberg.org/files/1228/1228-h/1228-h.htm

|url=https://www.gutenberg.org/files/1228/1228-h/1228-h.htm

|quote=So that in all probability a far longer period than 300 million years has elapsed since the latter part of the Secondary period. ... But now we may read in the Supplement to Lyell's 'Manual,' published in 1858, clear evidence of the existence of whales in the upper greensand, some time before the close of the secondary period. ... from all these circumstances, I inferred that had sessile cirripedes existed during the secondary periods, they would certainly have been preserved and discovered; and as not one species had been discovered in beds of this age, I concluded that this great group had been suddenly developed at the commencement of the tertiary series. ... Hence we now positively know that sessile cirripedes existed during the secondary period; and these cirripedes might have been the progenitors of our many tertiary and existing species. ... In some cases, however, the extermination of whole groups of beings, as of ammonites towards the close of the secondary period, has been wonderfully sudden.

|quote=So that in all probability a far longer period than 300 million years has elapsed since the latter part of the Secondary period. ... But now we may read in the Supplement to Lyell's 'Manual,' published in 1858, clear evidence of the existence of whales in the upper greensand, some time before the close of the secondary period. ... from all these circumstances, I inferred that had sessile cirripedes existed during the secondary periods, they would certainly have been preserved and discovered; and as not one species had been discovered in beds of this age, I concluded that this great group had been suddenly developed at the commencement of the tertiary series. ... Hence we now positively know that sessile cirripedes existed during the secondary period; and these cirripedes might have been the progenitors of our many tertiary and existing species. ... In some cases, however, the extermination of whole groups of beings, as of ammonites towards the close of the secondary period, has been wonderfully sudden.

|accessdate=26 Apr 2016}}</ref>  

|accessdate=26 Apr 2016}}</ref>  

|pages=23–26

|pages=23–26

|pages=121

|pages=121

|url=http://books.google.com/books?id=yvSEGgAACAAJ

|url=https://books.google.com/books?id=yvSEGgAACAAJ

|quote= You can't recognize that you hold conflicting opinions about something and hang on to both of them for very long. When you start disagreeing with yourself, you're in trouble.}}</ref> The trouble maintaining a train of thought in logical and coherent manner is regarded by [[medical science]] as symptom and characteristic of [[schizophrenia]].<ref>{{cite web |title=Schizophrenia: Symptoms, Types, Causes, and Early Warning Signs |publisher=helpguide.org |url= http://www.helpguide.org/articles/schizophrenia/schizophrenia-signs-types-and-causes.htm |accessdate=13 June 2015 |quote=Fragmented thinking is characteristic of schizophrenia. Externally, it can be observed in the way a person speaks. People with schizophrenia tend to have trouble concentrating and maintaining a train of thought. They may respond to queries with an unrelated answer, start sentences with one topic and end somewhere completely different, speak incoherently, or say illogical things.}}</ref>

|quote= You can't recognize that you hold conflicting opinions about something and hang on to both of them for very long. When you start disagreeing with yourself, you're in trouble.}}</ref> The trouble maintaining a train of thought in logical and coherent manner is regarded by [[medical science]] as symptom and characteristic of [[schizophrenia]].<ref>{{cite web |title=Schizophrenia: Symptoms, Types, Causes, and Early Warning Signs |publisher=helpguide.org |url= http://www.helpguide.org/articles/schizophrenia/schizophrenia-signs-types-and-causes.htm |accessdate=13 June 2015 |quote=Fragmented thinking is characteristic of schizophrenia. Externally, it can be observed in the way a person speaks. People with schizophrenia tend to have trouble concentrating and maintaining a train of thought. They may respond to queries with an unrelated answer, start sentences with one topic and end somewhere completely different, speak incoherently, or say illogical things.}}</ref>