ˌɪndˈiːd, ɪn dˈɑːktɚ. dˈeɪvɪd zˈʌks nˈaɪntiːnhˈʌndɹɪd nˈaɪnti wˈʌn ˈɑːɹɾɪkəl "dʒˈuːlɪəs dʒˈɛfɹiz ænd ðə fˌɪzɪˈɑːlədʒi ʌv lˈʌŋ vˈɑːljuːmz" hiː kəŋklˈuːdᵻd ðæt dʒˈuːlɪəs wʌzðə fˈɜːst fɪzˈɪʃən tə dᵻskɹˈaɪb ˈɔːl ʌvðɪ ˈæspɛkts ʌv lˈʌŋ vˈɑːljuːmz ɛksˈɛpt ðə dˈɛd spˈeɪs ɪnhˈeɪld ˈɛɹ ðæt nˈɛvɚ ɹˈiːtʃᵻz ðɪ ˈɛɹiəz ʌvðə lˈʌŋ wˌɛɹ ɡˈæs ɛkstʃˈeɪndʒ kæn əkˈɜː.
Indeed, in Dr. David Zuck's 1991 article "Julius Jeffreys and the Physiology of Lung Volumes" he concluded that Julius was the first physician to describe all of the aspects of lung volumes except the 'dead space' (inhaled air that never reaches the areas of the lung where gas exchange can occur).