ˌoʊvɚ ðə kˈoːɹs ʌv hɪz kɚɹˈɪɹ, ˌoʊvɚ wˈʌn θˈaʊzənd ɛŋɡɹˈeɪvɪŋz wɜː pɹədˈuːst bˈeɪst ˌɔn hˈiːkəlz skˈɛtʃᵻz ænd wˈɔːɾɚkˌʌlɚz; mˈɛnɪəv ðə bˈɛst ʌv ðiːz wɜː tʃˈoʊzən fɔːɹ , tɹænslˈeɪɾᵻd fɹʌm skˈɛtʃ tə pɹˈɪnt baɪ lɪθˈɑːɡɹəfɚɹ ˈædɑːlf ɡˈɪltʃ.
Over the course of his career, over 1000 engravings were produced based on Haeckel's sketches and watercolors; many of the best of these were chosen for , translated from sketch to print by lithographer Adolf Giltsch.