From enki on the Wallace and evolution. Informative and informed
'It is quite true that he struggled financially(sometimes because of his own bad judgements) and it is to Darwin's credit that he actively helped him secure an annual government pension for his lifetime contributions to science.
Unfortunately, he also had bad luck. In 1852 he lost all his specimens collected in South America(an exploration incidentally which was also partly inspired by von Humboldt's work) when the cargo of the brig, Helen, caught fire and the crew had to abandon ship. Later though he did manage to collect a huge number of specimens in the Malay Archipelago (126000+, several thousand of which were new to science).
He wrote the 'The Malay Archipelago' published in 1869, which, according to Wiki, became 'one of the most popular books of scientific exploration of the 19th century'. He was also a prolific writer, publishing 22 full length books and 508 scientific papers.
Although I am not clear what exactly you may mean by 'spirituality' here(surprise, surprise!)
I would suggest that by the end of the nineteenth century, attitudes to both science and religion had undergone powerful changes.
In the early 19th C. the prevailing mood was that religious faith and the sciences were generally seen to be in accordance with each other, as can be attested by the influence of Paley's 'Natural Theology' and the Bridgewater Treatises, for instance. However, as the century wore on, it became increasingly clear that science was challenging many religious concepts. Darwin, Lamarck and Russell were all part of that mix. Science was becoming increasingly professional in its approach, and focussing more singularly on the natural world. This didn't mean, of course, that eminent scientists, could not have their own beliefs.(e.g. James Clerk Maxwell was a Christian).
You would have to be much more specific on what 'secular spirituality' means for me to be able to comment on this.
Epigenetics has been discussed in detail before on this Forum, so I have little to add. The idea that hereditary information moves in only one direction, as proposed by Weismann, was a strong challenge of Lamarck's hereditary views of course, and, whatever one thinks about his theory of germinal selection, he was one of the first neo-Darwinists to focus on the genes(determinants) and genetic mutation. On the subject of Lamarck, it would depend on which part of his ideas you are considering, I think, as to whether he is proved right.'