text_original: At that temperature the silica of the mineral unites with the soda, and the carbonic acid is ex  pelled. But when the quantity of silica is small, or when it is totally absent, heating with carbonate of soda does not answer so well.
text_transcription: AT THAT TEMPERATURE THE SILICA OF THE MINERAL UNITES WITH THE SODA AND THE CARBONIC ACID IS EXPELLED BUT WHEN THE QUANTITY OF SILICA IS SMALL OR WHEN IT IS TOTALLY ABSENT HEATING WITH CARBONATE OF SODA DOES NOT ANSWER SO WELL
phonemes: æt ðæt tˈɛmpɹɪtʃɚ ðə sˈɪlɪkə ʌvðə mˈɪnɚɹəl juːnˈaɪts wɪððə sˈoʊdə, ænd ðə kɑːɹbˈɑːnɪk ˈæsɪd ɪz ˈɛks pˈɛld. bˌʌt wɛn ðə kwˈɔntᵻɾi ʌv sˈɪlɪkə ɪz smˈɔːl, ɔːɹ wɛn ɪɾ ɪz tˈoʊɾəli ˈæbsənt, hˈiːɾɪŋ wɪð kˈɑːɹbənˌeɪt ʌv sˈoʊdə dʌznˌɑːt ˈænsɚ sˌoʊ wˈɛl.